diff --git a/guide/content/css/govuk-design-system-formbuilder-guide.sass b/guide/content/css/govuk-design-system-formbuilder-guide.sass
index e5ce74f8..70c0c8b7 100644
--- a/guide/content/css/govuk-design-system-formbuilder-guide.sass
+++ b/guide/content/css/govuk-design-system-formbuilder-guide.sass
@@ -55,7 +55,14 @@ $tablet: 768px
 article > pre
   @include blue-left-border
 
-figure
+figure.image
+  margin: 0 0 2rem 0
+
+  img
+    width: 100%
+    max-width: 30em
+
+figure.full-sample
   @media screen and (max-width: $tablet)
     @include blue-top-border
   @media screen and (min-width: $tablet)
@@ -152,6 +159,12 @@ p, li, dt, dd, td, th
   &.govuk-tag-red
     background-color: $red
 
+  &.govuk-tag-govuk
+    background-color: govuk-colour('black')
+
+.govuk-summary-list__key > a
+  text-decoration: none
+
 .important
   background-color: govuk-tint(govuk_colour('yellow'), 80%)
   padding: 1.5em 1em
diff --git a/guide/content/introduction/configuration.slim b/guide/content/introduction/configuration.slim
index 34d0a6d2..989bdf50 100644
--- a/guide/content/introduction/configuration.slim
+++ b/guide/content/introduction/configuration.slim
@@ -17,6 +17,8 @@ p.govuk-body
   pre
     code.highlight.language-ruby
       | GOVUKDesignSystemFormBuilder.configure do |conf|
+          conf.brand                        = 'swanky-new-design-system'    # govuk
+
           conf.default_submit_button_text   = 'Apply'                       # Continue
           conf.default_error_summary_title  = 'Uh-oh, spaghettios'          # There is a problem
           conf.default_legend_tag           = 'h3'                          # h1
@@ -32,9 +34,9 @@ p.govuk-body
 
 p.govuk-body
   | For a full list and description of configuration options
-    #{link_to('check the documentation', config_documentation_link).html_safe}
-    and for more information on setting up localisations for your application, there's
-    a #{link_to('dedicated page in this guide', '/building-blocks/localisation').html_safe}.
+    #{link_to('check the documentation', config_documentation_link).html_safe} and
+    for an in-depth look at localising the form builder see
+     #{link_to('the guide page on localisation', '/building-blocks/localisation').html_safe}.
 
 p.govuk-body
   | If there are any settings you'd like to be able to set defaults for but
diff --git a/guide/content/introduction/supported-versions.slim b/guide/content/introduction/supported-versions.slim
index d9473c7f..355e7ef6 100644
--- a/guide/content/introduction/supported-versions.slim
+++ b/guide/content/introduction/supported-versions.slim
@@ -9,38 +9,38 @@ p.govuk-body
     latest stable versions of the GOV.UK Design System, Ruby and Rails.
 
 dl.govuk-summary-list
-  div.govuk-summary-list__row
+  .govuk-summary-list__row
     dt.govuk-summary-list__key
-      | GOV.UK Design System
+      == link_to('GOV.UK Design System', design_system_link)
     dl.govuk-summary-list__value
       ul.govuk-list
         li
-          span.govuk-tag
+          span.govuk-tag.govuk-tag-govuk
             | Version 3.6.0
 
-  div.govuk-summary-list__row
+  .govuk-summary-list__row
     dt.govuk-summary-list__key
-      | Ruby
+      == link_to('Ruby', 'https://www.ruby-lang.org')
     dl.govuk-summary-list__value
       ul.govuk-list
         li
           span.govuk-tag.govuk-tag-red
-            | 2.5.7
+            | 2.7.0
         li
           span.govuk-tag.govuk-tag-red
             | 2.6.5
         li
           span.govuk-tag.govuk-tag-red
-            | 2.7.0
+            | 2.5.7
 
-  div.govuk-summary-list__row
+  .govuk-summary-list__row
     dt.govuk-summary-list__key
-      | Rails
+      == link_to('Ruby on Rails', 'https://rubyonrails.org/')
     dl.govuk-summary-list__value
       ul.govuk-list
         li
           span.govuk-tag.govuk-tag-red
-            | 5.2.4
+            | 6.0.2
         li
           span.govuk-tag.govuk-tag-red
-            | 6.0.2
+            | 5.2.4
diff --git a/guide/layouts/partials/example-fig.slim b/guide/layouts/partials/example-fig.slim
index 2dc6ec72..da0c86d3 100644
--- a/guide/layouts/partials/example-fig.slim
+++ b/guide/layouts/partials/example-fig.slim
@@ -1,7 +1,7 @@
 - if defined?(custom_config)
   - custom_config
 
-figure
+figure.full-sample
   figcaption
     h3.govuk-heading-m.example-heading id=anchor_id(caption)
       == link_to caption, "#".concat(anchor_id(caption))
diff --git a/guide/layouts/partials/landing-page/links.slim b/guide/layouts/partials/landing-page/links.slim
index 6b1a9740..d239eeb1 100644
--- a/guide/layouts/partials/landing-page/links.slim
+++ b/guide/layouts/partials/landing-page/links.slim
@@ -18,6 +18,7 @@ section#links.govuk-width-container
         li== link_to 'Injecting content', '/building-blocks/injecting-content'
         li== link_to 'Fieldsets', '/building-blocks/fieldsets'
         li== link_to 'Localisation', '/building-blocks/localisation'
+        / li== link_to 'Other design systems', '/building-blocks/other-design-systems'
 
     .govuk-grid-column-one-third
       h2.govuk-heading-m Form elements
diff --git a/guide/lib/helpers/link_helpers.rb b/guide/lib/helpers/link_helpers.rb
index 67dd18de..7af06df0 100644
--- a/guide/lib/helpers/link_helpers.rb
+++ b/guide/lib/helpers/link_helpers.rb
@@ -85,5 +85,9 @@ def ruby_proc_link
     def project_new_issue_link
       'https://github.com/DFE-Digital/govuk_design_system_formbuilder/issues'
     end
+
+    def nhs_design_system_link
+      'https://service-manual.nhs.uk/design-system'
+    end
   end
 end
diff --git a/lib/govuk_design_system_formbuilder.rb b/lib/govuk_design_system_formbuilder.rb
index 6cc8e552..988ba522 100644
--- a/lib/govuk_design_system_formbuilder.rb
+++ b/lib/govuk_design_system_formbuilder.rb
@@ -11,6 +11,9 @@ module GOVUKDesignSystemFormBuilder
 
   # Default form builder configuration
   #
+  # * +:brand+ sets the value used to prefix all classes, used to allow the
+  #   builder to be branded for alternative (similar) design systems.
+  #
   # * +:default_legend_size+ controls the default size of legend text.
   #   Can be either +xl+, +l+, +m+ or +s+.
   #
@@ -38,6 +41,8 @@ module GOVUKDesignSystemFormBuilder
   #   particular context, allowing them to be independently customised.
   # ===
   DEFAULTS = {
+    brand: 'govuk',
+
     default_legend_size: 'm',
     default_legend_tag: 'h1',
     default_submit_button_text: 'Continue',
diff --git a/lib/govuk_design_system_formbuilder/base.rb b/lib/govuk_design_system_formbuilder/base.rb
index 21269cba..a8cb2bda 100644
--- a/lib/govuk_design_system_formbuilder/base.rb
+++ b/lib/govuk_design_system_formbuilder/base.rb
@@ -1,4 +1,12 @@
 module GOVUKDesignSystemFormBuilder
+  module PrefixableArray
+    refine Array do
+      def prefix(text, delimiter: '-')
+        map { |item| text + delimiter + item }
+      end
+    end
+  end
+
   class Base
     delegate :capture, :content_tag, :safe_join, :tag, :raw, :link_to, to: :@builder
     delegate :config, to: GOVUKDesignSystemFormBuilder
@@ -12,6 +20,10 @@ def initialize(builder, object_name, attribute_name, &block)
 
   private
 
+    def brand(override = nil)
+      override || config.brand
+    end
+
     # returns the id value used for the input
     #
     # @note field_id is overridden so that the error summary can link to the
diff --git a/lib/govuk_design_system_formbuilder/containers/character_count.rb b/lib/govuk_design_system_formbuilder/containers/character_count.rb
index 28b68e2a..ec98c10c 100644
--- a/lib/govuk_design_system_formbuilder/containers/character_count.rb
+++ b/lib/govuk_design_system_formbuilder/containers/character_count.rb
@@ -16,8 +16,8 @@ def html
 
         content_tag(
           'div',
-          class: 'govuk-character-count',
-          data: { module: 'govuk-character-count' }.merge(**limit, **threshold).compact
+          class: %(#{brand}-character-count),
+          data: { module: %(#{brand}-character-count) }.merge(**limit, **threshold).compact
         ) do
           yield
         end
diff --git a/lib/govuk_design_system_formbuilder/containers/check_boxes.rb b/lib/govuk_design_system_formbuilder/containers/check_boxes.rb
index 52b37a0a..4454bc8a 100644
--- a/lib/govuk_design_system_formbuilder/containers/check_boxes.rb
+++ b/lib/govuk_design_system_formbuilder/containers/check_boxes.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Containers
     class CheckBoxes < Base
+      using PrefixableArray
+
       def initialize(builder, small:, classes: nil)
         @builder = builder
         @small   = small
@@ -8,7 +10,7 @@ def initialize(builder, small:, classes: nil)
       end
 
       def html
-        content_tag('div', class: check_boxes_classes, data: { module: 'govuk-checkboxes' }) do
+        content_tag('div', class: check_boxes_classes, data: { module: %(#{brand}-checkboxes) }) do
           yield
         end
       end
@@ -16,8 +18,8 @@ def html
     private
 
       def check_boxes_classes
-        %w(govuk-checkboxes).tap do |c|
-          c.push('govuk-checkboxes--small') if @small
+        %w(checkboxes).prefix(brand).tap do |c|
+          c.push(%(#{brand}-checkboxes--small)) if @small
           c.push(@classes) if @classes
         end
       end
diff --git a/lib/govuk_design_system_formbuilder/containers/fieldset.rb b/lib/govuk_design_system_formbuilder/containers/fieldset.rb
index 937b3a57..e2a90288 100644
--- a/lib/govuk_design_system_formbuilder/containers/fieldset.rb
+++ b/lib/govuk_design_system_formbuilder/containers/fieldset.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Containers
     class Fieldset < Base
+      using PrefixableArray
+
       include Traits::Localisation
 
       LEGEND_SIZES = %w(xl l m s).freeze
@@ -43,21 +45,20 @@ def legend_text
       end
 
       def fieldset_classes
-        %w(govuk-fieldset)
+        %w(fieldset).prefix(brand)
       end
 
       def legend_classes
         size = @legend.dig(:size)
         fail "invalid size '#{size}', must be #{LEGEND_SIZES.join(', ')}" unless size.in?(LEGEND_SIZES)
 
-        classes = %W(govuk-fieldset__legend govuk-fieldset__legend--#{size})
-        classes.push('govuk-visually-hidden') if @legend.dig(:hidden)
-
-        classes
+        [%(fieldset__legend), %(fieldset__legend--#{size})].prefix(brand).tap do |classes|
+          classes.push(%(#{brand}-visually-hidden)) if @legend.dig(:hidden)
+        end
       end
 
       def legend_heading_classes
-        %(govuk-fieldset__heading)
+        %w(fieldset__heading).prefix(brand)
       end
     end
   end
diff --git a/lib/govuk_design_system_formbuilder/containers/form_group.rb b/lib/govuk_design_system_formbuilder/containers/form_group.rb
index 0e631942..c91b31d1 100644
--- a/lib/govuk_design_system_formbuilder/containers/form_group.rb
+++ b/lib/govuk_design_system_formbuilder/containers/form_group.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Containers
     class FormGroup < Base
+      using PrefixableArray
+
       def initialize(builder, object_name, attribute_name)
         super(builder, object_name, attribute_name)
       end
@@ -14,8 +16,8 @@ def html
     private
 
       def form_group_classes
-        %w(govuk-form-group).tap do |classes|
-          classes.push('govuk-form-group--error') if has_errors?
+        %w(form-group).prefix(brand).tap do |classes|
+          classes.push(%(#{brand}-form-group--error)) if has_errors?
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/containers/radios.rb b/lib/govuk_design_system_formbuilder/containers/radios.rb
index 2a39251a..cd1b9180 100644
--- a/lib/govuk_design_system_formbuilder/containers/radios.rb
+++ b/lib/govuk_design_system_formbuilder/containers/radios.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Containers
     class Radios < Base
+      using PrefixableArray
+
       include Traits::Hint
 
       def initialize(builder, inline:, small:, classes:)
@@ -11,7 +13,7 @@ def initialize(builder, inline:, small:, classes:)
       end
 
       def html
-        content_tag('div', class: radios_classes, data: { module: 'govuk-radios' }) do
+        content_tag('div', class: radios_classes, data: { module: %(#{brand}-radios) }) do
           yield
         end
       end
@@ -19,10 +21,10 @@ def html
     private
 
       def radios_classes
-        %w(govuk-radios).tap do |c|
-          c.push('govuk-radios--inline') if @inline
-          c.push('govuk-radios--small')  if @small
-          c.push(@classes)               if @classes
+        %w(radios).prefix(brand).tap do |c|
+          c.push(%(#{brand}-radios--inline)) if @inline
+          c.push(%(#{brand}-radios--small))  if @small
+          c.push(@classes)                   if @classes
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/check_boxes/collection_check_box.rb b/lib/govuk_design_system_formbuilder/elements/check_boxes/collection_check_box.rb
index 639a605b..c5203396 100644
--- a/lib/govuk_design_system_formbuilder/elements/check_boxes/collection_check_box.rb
+++ b/lib/govuk_design_system_formbuilder/elements/check_boxes/collection_check_box.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module CheckBoxes
       class CollectionCheckBox < Base
+        using PrefixableArray
+
         include Traits::CollectionItem
         include Traits::Hint
 
@@ -16,12 +18,12 @@ def initialize(builder, object_name, attribute_name, checkbox, hint_method = nil
         end
 
         def html
-          content_tag('div', class: 'govuk-checkboxes__item') do
+          content_tag('div', class: %(#{brand}-checkboxes__item)) do
             safe_join(
               [
                 @checkbox.check_box(
                   id: field_id(link_errors: @link_errors),
-                  class: "govuk-checkboxes__input",
+                  class: %(#{brand}-checkboxes__input),
                   aria: { describedby: hint_id }
                 ),
                 label_element.html,
diff --git a/lib/govuk_design_system_formbuilder/elements/check_boxes/fieldset_check_box.rb b/lib/govuk_design_system_formbuilder/elements/check_boxes/fieldset_check_box.rb
index a95cf183..40f694f4 100644
--- a/lib/govuk_design_system_formbuilder/elements/check_boxes/fieldset_check_box.rb
+++ b/lib/govuk_design_system_formbuilder/elements/check_boxes/fieldset_check_box.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module CheckBoxes
       class FieldsetCheckBox < Base
+        using PrefixableArray
+
         include Traits::Hint
         include Traits::Conditional
 
@@ -23,7 +25,7 @@ def initialize(builder, object_name, attribute_name, value, label:, hint_text:,
         def html
           safe_join(
             [
-              content_tag('div', class: 'govuk-checkboxes__item') do
+              content_tag('div', class: %(#{brand}-checkboxes__item)) do
                 safe_join(
                   [
                     input,
@@ -63,11 +65,11 @@ def hint_element
         end
 
         def conditional_classes
-          %w(govuk-checkboxes__conditional govuk-checkboxes__conditional--hidden)
+          %w(checkboxes__conditional checkboxes__conditional--hidden).prefix(brand)
         end
 
         def check_box_classes
-          %w(govuk-checkboxes__input)
+          %w(checkboxes__input).prefix(brand)
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/check_boxes/label.rb b/lib/govuk_design_system_formbuilder/elements/check_boxes/label.rb
index dd6c1112..9c59332a 100644
--- a/lib/govuk_design_system_formbuilder/elements/check_boxes/label.rb
+++ b/lib/govuk_design_system_formbuilder/elements/check_boxes/label.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module CheckBoxes
       class Label < Base
+        using PrefixableArray
+
         include Traits::Localisation
 
         def initialize(builder, object_name, attribute_name, checkbox, value:, link_errors: true)
@@ -21,7 +23,7 @@ def html
       private
 
         def label_classes
-          %w(govuk-label govuk-checkboxes__label)
+          %w(label checkboxes__label).prefix(brand)
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/date.rb b/lib/govuk_design_system_formbuilder/elements/date.rb
index 65dd03c8..6eeff7ce 100644
--- a/lib/govuk_design_system_formbuilder/elements/date.rb
+++ b/lib/govuk_design_system_formbuilder/elements/date.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class Date < Base
+      using PrefixableArray
+
       include Traits::Error
       include Traits::Hint
       include Traits::Supplemental
@@ -24,7 +26,7 @@ def html
                 supplemental_content.html,
                 hint_element.html,
                 error_element.html,
-                content_tag('div', class: 'govuk-date-input') do
+                content_tag('div', class: %(#{brand}-date-input)) do
                   safe_join([day, month, year])
                 end
               ]
@@ -56,8 +58,8 @@ def year
       def date_input_item(segment, width: 2, link_errors: false)
         value = @builder.object.try(@attribute_name).try(segment)
 
-        content_tag('div', class: %w(govuk-date-input__item)) do
-          content_tag('div', class: %w(govuk-form-group)) do
+        content_tag('div', class: %w(date-input__item).prefix(brand)) do
+          content_tag('div', class: %w(form-group).prefix(brand)) do
             safe_join(
               [
                 tag.label(
@@ -83,14 +85,14 @@ def date_input_item(segment, width: 2, link_errors: false)
       end
 
       def date_input_classes(width)
-        %w(govuk-input govuk-date-input__input).tap do |classes|
-          classes.push("govuk-input--width-#{width}")
-          classes.push("govuk-input--error") if has_errors?
+        %w(input date-input__input).prefix(brand).tap do |classes|
+          classes.push(%(#{brand}-input--width-#{width}))
+          classes.push(%(#{brand}-input--error)) if has_errors?
         end
       end
 
       def date_input_label_classes
-        %w(govuk-label govuk-date-input__label)
+        %w(label date-input__label).prefix(brand)
       end
 
       # if the field has errors we want the govuk_error_summary to
diff --git a/lib/govuk_design_system_formbuilder/elements/error_message.rb b/lib/govuk_design_system_formbuilder/elements/error_message.rb
index b86c5763..858300bc 100644
--- a/lib/govuk_design_system_formbuilder/elements/error_message.rb
+++ b/lib/govuk_design_system_formbuilder/elements/error_message.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class ErrorMessage < Base
+      using PrefixableArray
+
       include Traits::Error
 
       def initialize(builder, object_name, attribute_name)
@@ -10,10 +12,10 @@ def initialize(builder, object_name, attribute_name)
       def html
         return nil unless has_errors?
 
-        content_tag('span', class: 'govuk-error-message', id: error_id) do
+        content_tag('span', class: %(#{brand}-error-message), id: error_id) do
           safe_join(
             [
-              tag.span('Error: ', class: 'govuk-visually-hidden'),
+              tag.span('Error: ', class: %(#{brand}-visually-hidden)),
               message
             ]
           )
diff --git a/lib/govuk_design_system_formbuilder/elements/error_summary.rb b/lib/govuk_design_system_formbuilder/elements/error_summary.rb
index 511fc841..802598f0 100644
--- a/lib/govuk_design_system_formbuilder/elements/error_summary.rb
+++ b/lib/govuk_design_system_formbuilder/elements/error_summary.rb
@@ -17,7 +17,7 @@ def html
             [
               tag.h2(@title, id: error_summary_title_id, class: summary_class('title')),
               content_tag('div', class: summary_class('body')) do
-                content_tag('ul', class: ['govuk-list', summary_class('list')]) do
+                content_tag('ul', class: [%(#{brand}-list), summary_class('list')]) do
                   safe_join(
                     @builder.object.errors.messages.map do |attribute, messages|
                       error_list_item(attribute, messages.first)
@@ -50,9 +50,9 @@ def same_page_link(target)
 
       def summary_class(part = nil)
         if part
-          'govuk-error-summary'.concat('__', part)
+          %(#{brand}-error-summary).concat('__', part)
         else
-          'govuk-error-summary'
+          %(#{brand}-error-summary)
         end
       end
 
@@ -73,7 +73,7 @@ def error_summary_attributes
           tabindex: -1,
           role: 'alert',
           data: {
-            module: 'govuk-error-summary'
+            module: %(#{brand}-error-summary)
           },
           aria: {
             labelledby: error_summary_title_id
diff --git a/lib/govuk_design_system_formbuilder/elements/file.rb b/lib/govuk_design_system_formbuilder/elements/file.rb
index 1a4c9331..5bfad207 100644
--- a/lib/govuk_design_system_formbuilder/elements/file.rb
+++ b/lib/govuk_design_system_formbuilder/elements/file.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class File < Base
+      using PrefixableArray
+
       include Traits::Error
       include Traits::Hint
       include Traits::Label
@@ -37,8 +39,8 @@ def html
     private
 
       def file_classes
-        %w(govuk-file-upload).tap do |c|
-          c.push('govuk-file-upload--error') if has_errors?
+        %w(file-upload).prefix(brand).tap do |c|
+          c.push(%(#{brand}-file-upload--error)) if has_errors?
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/hint.rb b/lib/govuk_design_system_formbuilder/elements/hint.rb
index d5bf9206..e798f08e 100644
--- a/lib/govuk_design_system_formbuilder/elements/hint.rb
+++ b/lib/govuk_design_system_formbuilder/elements/hint.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class Hint < Base
+      using PrefixableArray
+
       include Traits::Hint
       include Traits::Localisation
 
@@ -29,15 +31,15 @@ def hint_text(supplied)
       end
 
       def hint_classes
-        %w(govuk-hint).push(@radio_class, @checkbox_class).compact
+        %w(hint).prefix(brand).push(@radio_class, @checkbox_class).compact
       end
 
       def radio_class(radio)
-        radio ? 'govuk-radios__hint' : nil
+        radio ? %(#{brand}-radios__hint) : nil
       end
 
       def checkbox_class(checkbox)
-        checkbox ? 'govuk-checkboxes__hint' : nil
+        checkbox ? %(#{brand}-checkboxes__hint) : nil
       end
     end
   end
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/email.rb b/lib/govuk_design_system_formbuilder/elements/inputs/email.rb
index 8d47b10c..dfef212e 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/email.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/email.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class Email < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/number.rb b/lib/govuk_design_system_formbuilder/elements/inputs/number.rb
index a4038c75..8becae74 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/number.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/number.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class Number < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/password.rb b/lib/govuk_design_system_formbuilder/elements/inputs/password.rb
index e850f50a..684ae893 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/password.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/password.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class Password < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/phone.rb b/lib/govuk_design_system_formbuilder/elements/inputs/phone.rb
index 1fe15c4c..e33f52ba 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/phone.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/phone.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class Phone < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/text.rb b/lib/govuk_design_system_formbuilder/elements/inputs/text.rb
index 431a712c..b337fb17 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/text.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/text.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class Text < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/inputs/url.rb b/lib/govuk_design_system_formbuilder/elements/inputs/url.rb
index 9a1181d1..e4afabd9 100644
--- a/lib/govuk_design_system_formbuilder/elements/inputs/url.rb
+++ b/lib/govuk_design_system_formbuilder/elements/inputs/url.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Inputs
       class URL < Base
+        using PrefixableArray
+
         include Traits::Input
         include Traits::Error
         include Traits::Hint
diff --git a/lib/govuk_design_system_formbuilder/elements/label.rb b/lib/govuk_design_system_formbuilder/elements/label.rb
index 427c5f17..85df8a31 100644
--- a/lib/govuk_design_system_formbuilder/elements/label.rb
+++ b/lib/govuk_design_system_formbuilder/elements/label.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class Label < Base
+      using PrefixableArray
+
       include Traits::Localisation
 
       def initialize(builder, object_name, attribute_name, text: nil, value: nil, size: nil, hidden: false, radio: false, checkbox: false, tag: nil, link_errors: true)
@@ -19,7 +21,7 @@ def html
         return nil if @text.blank?
 
         if @tag.present?
-          content_tag(@tag, class: 'govuk-label-wrapper') { build_label }
+          content_tag(@tag, class: %(#{brand}-label-wrapper)) { build_label }
         else
           build_label
         end
@@ -32,7 +34,7 @@ def build_label
           @attribute_name,
           value: @value,
           for: field_id(link_errors: @link_errors),
-          class: %w(govuk-label).push(@size_class, @weight_class, @radio_class, @checkbox_class).compact
+          class: %w(label).prefix(brand).push(@size_class, @weight_class, @radio_class, @checkbox_class).compact
         ) do
           @text
         end
@@ -42,26 +44,26 @@ def label_text(option_text, hidden)
         text = [option_text, localised_text(:label), @attribute_name.capitalize].compact.first.to_s
 
         if hidden
-          tag.span(text, class: %w(govuk-visually-hidden))
+          tag.span(text, class: %w(visually-hidden).prefix(brand))
         else
           text
         end
       end
 
       def radio_class(radio)
-        radio ? 'govuk-radios__label' : nil
+        radio ? %(#{brand}-radios__label) : nil
       end
 
       def checkbox_class(checkbox)
-        checkbox ? 'govuk-checkboxes__label' : nil
+        checkbox ? %(#{brand}-checkboxes__label) : nil
       end
 
       def label_size_class(size)
         case size
-        when 'xl'      then "govuk-label--xl"
-        when 'l'       then "govuk-label--l"
-        when 'm'       then "govuk-label--m"
-        when 's'       then "govuk-label--s"
+        when 'xl'      then %(#{brand}-label--xl)
+        when 'l'       then %(#{brand}-label--l)
+        when 'm'       then %(#{brand}-label--m)
+        when 's'       then %(#{brand}-label--s)
         when nil       then nil
         else
           fail "invalid size '#{size}', must be xl, l, m, s or nil"
diff --git a/lib/govuk_design_system_formbuilder/elements/radios/collection_radio_button.rb b/lib/govuk_design_system_formbuilder/elements/radios/collection_radio_button.rb
index 6aa6d447..3979f799 100644
--- a/lib/govuk_design_system_formbuilder/elements/radios/collection_radio_button.rb
+++ b/lib/govuk_design_system_formbuilder/elements/radios/collection_radio_button.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Radios
       class CollectionRadioButton < Base
+        using PrefixableArray
+
         include Traits::Hint
         include Traits::CollectionItem
 
@@ -21,7 +23,7 @@ def initialize(builder, object_name, attribute_name, item, value_method:, text_m
         end
 
         def html
-          content_tag('div', class: 'govuk-radios__item') do
+          content_tag('div', class: %(#{brand}-radios__item)) do
             safe_join(
               [
                 @builder.radio_button(
@@ -29,7 +31,7 @@ def html
                   @value,
                   id: field_id(link_errors: @link_errors),
                   aria: { describedby: hint_id },
-                  class: %w(govuk-radios__input)
+                  class: %w(radios__input).prefix(brand)
                 ),
                 label_element.html,
                 hint_element.html
diff --git a/lib/govuk_design_system_formbuilder/elements/radios/fieldset_radio_button.rb b/lib/govuk_design_system_formbuilder/elements/radios/fieldset_radio_button.rb
index 934654fa..7ef08488 100644
--- a/lib/govuk_design_system_formbuilder/elements/radios/fieldset_radio_button.rb
+++ b/lib/govuk_design_system_formbuilder/elements/radios/fieldset_radio_button.rb
@@ -2,6 +2,8 @@ module GOVUKDesignSystemFormBuilder
   module Elements
     module Radios
       class FieldsetRadioButton < Base
+        using PrefixableArray
+
         include Traits::Hint
         include Traits::Conditional
 
@@ -22,7 +24,7 @@ def initialize(builder, object_name, attribute_name, value, label:, hint_text:,
         def html
           safe_join(
             [
-              content_tag('div', class: 'govuk-radios__item') do
+              content_tag('div', class: %(#{brand}-radios__item)) do
                 safe_join(
                   [
                     input,
@@ -53,12 +55,12 @@ def input
             id: field_id(link_errors: @link_errors),
             aria: { describedby: hint_id },
             data: { 'aria-controls' => @conditional_id },
-            class: %w(govuk-radios__input)
+            class: %w(radios__input).prefix(brand)
           )
         end
 
         def conditional_classes
-          %w(govuk-radios__conditional govuk-radios__conditional--hidden)
+          %w(radios__conditional radios__conditional--hidden).prefix(brand)
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/select.rb b/lib/govuk_design_system_formbuilder/elements/select.rb
index 3db6426c..8738aa54 100644
--- a/lib/govuk_design_system_formbuilder/elements/select.rb
+++ b/lib/govuk_design_system_formbuilder/elements/select.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class Select < Base
+      using PrefixableArray
+
       include Traits::Error
       include Traits::Label
       include Traits::Hint
@@ -50,8 +52,8 @@ def build_html_options
       end
 
       def select_classes
-        %w(govuk-select).tap do |classes|
-          classes.push('govuk-select--error') if has_errors?
+        %w(select).prefix(brand).tap do |classes|
+          classes.push(%(#{brand}-select--error)) if has_errors?
         end
       end
     end
diff --git a/lib/govuk_design_system_formbuilder/elements/submit.rb b/lib/govuk_design_system_formbuilder/elements/submit.rb
index cc1ff47d..d76b9568 100644
--- a/lib/govuk_design_system_formbuilder/elements/submit.rb
+++ b/lib/govuk_design_system_formbuilder/elements/submit.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class Submit < Base
+      using PrefixableArray
+
       def initialize(builder, text, warning:, secondary:, classes:, prevent_double_click:, validate:, &block)
         fail ArgumentError, 'buttons can be warning or secondary' if warning && secondary
 
@@ -19,7 +21,7 @@ def html
           [
             @builder.submit(
               @text,
-              class: %w(govuk-button).push(
+              class: %w(button).prefix(brand).push(
                 warning_class,
                 secondary_class,
                 @classes,
@@ -35,23 +37,22 @@ def html
     private
 
       def warning_class
-        'govuk-button--warning' if @warning
+        %(#{brand}-button--warning) if @warning
       end
 
       def secondary_class
-        'govuk-button--secondary' if @secondary
+        %(#{brand}-button--secondary) if @secondary
       end
 
       def padding_class(content_present)
-        'govuk-!-margin-right-1' if content_present
+        %(#{brand}-!-margin-right-1) if content_present
       end
 
       def extra_args
         {
           formnovalidate: !@validate,
           data: {
-            module: 'govuk-button',
-            'prevent-double-click' => @prevent_double_click
+            module: %(#{brand}-button), 'prevent-double-click' => @prevent_double_click
           }.select { |_k, v| v.present? }
         }
       end
diff --git a/lib/govuk_design_system_formbuilder/elements/text_area.rb b/lib/govuk_design_system_formbuilder/elements/text_area.rb
index e9fe6b0f..fc52a7d6 100644
--- a/lib/govuk_design_system_formbuilder/elements/text_area.rb
+++ b/lib/govuk_design_system_formbuilder/elements/text_area.rb
@@ -1,6 +1,8 @@
 module GOVUKDesignSystemFormBuilder
   module Elements
     class TextArea < Base
+      using PrefixableArray
+
       include Traits::Error
       include Traits::Hint
       include Traits::Label
@@ -48,9 +50,9 @@ def html
     private
 
       def govuk_textarea_classes
-        %w(govuk-textarea).tap do |classes|
-          classes.push('govuk-textarea--error') if has_errors?
-          classes.push('govuk-js-character-count') if limit?
+        %w(textarea).prefix(brand).tap do |classes|
+          classes.push(%(#{brand}-textarea--error)) if has_errors?
+          classes.push(%(#{brand}-js-character-count)) if limit?
         end
       end
 
@@ -69,11 +71,15 @@ def limit?
       def limit_description
         return nil unless limit?
 
-        content_tag('span', id: limit_id, class: %w(govuk-hint govuk-character-count__message), aria: { live: 'polite' }) do
+        content_tag('span', id: limit_id, class: limit_description_classes, aria: { live: 'polite' }) do
           "You can enter up to #{limit_quantity} #{limit_type}"
         end
       end
 
+      def limit_description_classes
+        %w(hint character-count__message).prefix(brand)
+      end
+
       def limit_quantity
         @max_words || @max_chars
       end
diff --git a/lib/govuk_design_system_formbuilder/traits/input.rb b/lib/govuk_design_system_formbuilder/traits/input.rb
index 411abf1a..f630cee0 100644
--- a/lib/govuk_design_system_formbuilder/traits/input.rb
+++ b/lib/govuk_design_system_formbuilder/traits/input.rb
@@ -40,11 +40,11 @@ def html
     private
 
       def input_classes
-        %w(govuk-input).push(width_classes, error_classes).compact
+        [%(#{brand}-input)].push(width_classes, error_classes).compact
       end
 
       def error_classes
-        'govuk-input--error' if has_errors?
+        %(#{brand}-input--error) if has_errors?
       end
 
       def width_classes
@@ -53,20 +53,20 @@ def width_classes
         case @width
 
           # fixed (character) widths
-        when 20 then 'govuk-input--width-20'
-        when 10 then 'govuk-input--width-10'
-        when 5  then 'govuk-input--width-5'
-        when 4  then 'govuk-input--width-4'
-        when 3  then 'govuk-input--width-3'
-        when 2  then 'govuk-input--width-2'
+        when 20 then %(#{brand}-input--width-20)
+        when 10 then %(#{brand}-input--width-10)
+        when 5  then %(#{brand}-input--width-5)
+        when 4  then %(#{brand}-input--width-4)
+        when 3  then %(#{brand}-input--width-3)
+        when 2  then %(#{brand}-input--width-2)
 
           # fluid widths
-        when 'full'           then 'govuk-!-width-full'
-        when 'three-quarters' then 'govuk-!-width-three-quarters'
-        when 'two-thirds'     then 'govuk-!-width-two-thirds'
-        when 'one-half'       then 'govuk-!-width-one-half'
-        when 'one-third'      then 'govuk-!-width-one-third'
-        when 'one-quarter'    then 'govuk-!-width-one-quarter'
+        when 'full'           then %(#{brand}-!-width-full)
+        when 'three-quarters' then %(#{brand}-!-width-three-quarters)
+        when 'two-thirds'     then %(#{brand}-!-width-two-thirds)
+        when 'one-half'       then %(#{brand}-!-width-one-half)
+        when 'one-third'      then %(#{brand}-!-width-one-third)
+        when 'one-quarter'    then %(#{brand}-!-width-one-quarter)
 
         else fail(ArgumentError, "invalid width '#{@width}'")
         end
diff --git a/lib/govuk_design_system_formbuilder/version.rb b/lib/govuk_design_system_formbuilder/version.rb
index ececdaa9..f211bc3a 100644
--- a/lib/govuk_design_system_formbuilder/version.rb
+++ b/lib/govuk_design_system_formbuilder/version.rb
@@ -1,3 +1,3 @@
 module GOVUKDesignSystemFormBuilder
-  VERSION = '1.1.11'.freeze
+  VERSION = '1.2.0b3'.freeze
 end
diff --git a/spec/govuk_design_system_formbuilder/builder/check_boxes/check_box_spec.rb b/spec/govuk_design_system_formbuilder/builder/check_boxes/check_box_spec.rb
index 8f3e826d..4dd5ee71 100644
--- a/spec/govuk_design_system_formbuilder/builder/check_boxes/check_box_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/check_boxes/check_box_spec.rb
@@ -20,6 +20,8 @@
       end
     end
 
+    it_behaves_like 'a field that supports custom branding'
+
     it_behaves_like 'a field that supports labels' do
       let(:label_text) { 'Project X' }
       # the reason we're specifying the type is that
diff --git a/spec/govuk_design_system_formbuilder/builder/check_boxes/collection_spec.rb b/spec/govuk_design_system_formbuilder/builder/check_boxes/collection_spec.rb
index 1cded6c3..bba3cafe 100644
--- a/spec/govuk_design_system_formbuilder/builder/check_boxes/collection_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/check_boxes/collection_spec.rb
@@ -35,6 +35,8 @@
       let(:described_element) { 'fieldset' }
     end
 
+    it_behaves_like 'a field that supports custom branding'
+
     it_behaves_like 'a field that supports setting the legend via localisation'
     it_behaves_like 'a field that supports setting the hint via localisation'
 
diff --git a/spec/govuk_design_system_formbuilder/builder/check_boxes/fieldset_spec.rb b/spec/govuk_design_system_formbuilder/builder/check_boxes/fieldset_spec.rb
index 3c457538..2d854b41 100644
--- a/spec/govuk_design_system_formbuilder/builder/check_boxes/fieldset_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/check_boxes/fieldset_spec.rb
@@ -27,6 +27,8 @@
       let(:error_identifier) { 'person-projects-error' }
     end
 
+    it_behaves_like 'a field that supports custom branding'
+
     it_behaves_like 'a field that supports setting the hint via localisation'
     it_behaves_like 'a field that supports setting the legend via localisation'
 
diff --git a/spec/govuk_design_system_formbuilder/builder/date_spec.rb b/spec/govuk_design_system_formbuilder/builder/date_spec.rb
index 2c32b56f..88670fa1 100644
--- a/spec/govuk_design_system_formbuilder/builder/date_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/date_spec.rb
@@ -61,6 +61,7 @@
 
     it_behaves_like 'a field that supports setting the legend via localisation'
     it_behaves_like 'a field that supports setting the hint via localisation'
+    it_behaves_like 'a field that supports custom branding'
 
     it_behaves_like 'a field that accepts a plain ruby object' do
       let(:described_element) { ['input', { count: 3 }] }
diff --git a/spec/govuk_design_system_formbuilder/builder/file_spec.rb b/spec/govuk_design_system_formbuilder/builder/file_spec.rb
index 5166181f..25fe575c 100644
--- a/spec/govuk_design_system_formbuilder/builder/file_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/file_spec.rb
@@ -19,6 +19,7 @@
     end
 
     it_behaves_like 'a field that supports labels'
+    it_behaves_like 'a field that supports custom branding'
 
     it_behaves_like 'a field that accepts arbitrary blocks of HTML' do
       let(:described_element) { 'input' }
diff --git a/spec/govuk_design_system_formbuilder/builder/radios/collection_spec.rb b/spec/govuk_design_system_formbuilder/builder/radios/collection_spec.rb
index a1abd3c2..d9caeaec 100644
--- a/spec/govuk_design_system_formbuilder/builder/radios/collection_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/radios/collection_spec.rb
@@ -23,6 +23,8 @@
       end
     end
 
+    it_behaves_like 'a field that supports custom branding'
+
     it_behaves_like 'a field that supports a fieldset with legend' do
       let(:legend_text) { 'Pick your favourite colour' }
     end
diff --git a/spec/govuk_design_system_formbuilder/builder/radios/fieldset_spec.rb b/spec/govuk_design_system_formbuilder/builder/radios/fieldset_spec.rb
index 1bf20fdb..fc91c67e 100644
--- a/spec/govuk_design_system_formbuilder/builder/radios/fieldset_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/radios/fieldset_spec.rb
@@ -29,6 +29,8 @@
       let(:error_identifier) { 'person-favourite-colour-error' }
     end
 
+    it_behaves_like 'a field that supports custom branding'
+
     it_behaves_like 'a field that supports setting the hint via localisation'
     it_behaves_like 'a field that supports setting the legend via localisation'
 
diff --git a/spec/govuk_design_system_formbuilder/builder/radios/radio_button_spec.rb b/spec/govuk_design_system_formbuilder/builder/radios/radio_button_spec.rb
index 5d5c90a6..a6b86998 100644
--- a/spec/govuk_design_system_formbuilder/builder/radios/radio_button_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/radios/radio_button_spec.rb
@@ -10,6 +10,8 @@
 
     subject { builder.send(*args) }
 
+    it_behaves_like 'a field that supports custom branding'
+
     specify 'output should contain a radio item group with a radio input' do
       expect(subject).to have_tag('div', with: { class: 'govuk-radios__item' }) do |ri|
         expect(ri).to have_tag('input', with: { type: 'radio', value: value })
diff --git a/spec/govuk_design_system_formbuilder/builder/select_spec.rb b/spec/govuk_design_system_formbuilder/builder/select_spec.rb
index 178e4d73..259fdd37 100644
--- a/spec/govuk_design_system_formbuilder/builder/select_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/select_spec.rb
@@ -16,6 +16,7 @@
     it_behaves_like 'a field that supports labels'
 
     it_behaves_like 'a field that supports hints'
+    it_behaves_like 'a field that supports custom branding'
 
     it_behaves_like 'a field that supports errors' do
       let(:error_message) { /Choose a favourite colour/ }
diff --git a/spec/govuk_design_system_formbuilder/builder/submit_spec.rb b/spec/govuk_design_system_formbuilder/builder/submit_spec.rb
index c4506ad6..cfa575dc 100644
--- a/spec/govuk_design_system_formbuilder/builder/submit_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/submit_spec.rb
@@ -7,6 +7,8 @@
     let(:args) { [method] }
     subject { builder.send(method, text) }
 
+    it_behaves_like 'a field that supports custom branding'
+
     specify 'output should be a submit input' do
       expect(subject).to have_tag('input', with: { type: 'submit' })
     end
diff --git a/spec/govuk_design_system_formbuilder/builder/text_area_spec.rb b/spec/govuk_design_system_formbuilder/builder/text_area_spec.rb
index 71c21ed6..f4ce2600 100644
--- a/spec/govuk_design_system_formbuilder/builder/text_area_spec.rb
+++ b/spec/govuk_design_system_formbuilder/builder/text_area_spec.rb
@@ -46,6 +46,8 @@
     let(:aria_described_by_target) { 'textarea' }
   end
 
+  it_behaves_like 'a field that supports custom branding'
+
   it_behaves_like 'a field that supports errors' do
     let(:object) { Person.new(cv: 'a' * 50) } # max length is 30
     let(:aria_described_by_target) { 'textarea' }
diff --git a/spec/support/shared/shared_supports_branding_examples.rb b/spec/support/shared/shared_supports_branding_examples.rb
new file mode 100644
index 00000000..bb678f85
--- /dev/null
+++ b/spec/support/shared/shared_supports_branding_examples.rb
@@ -0,0 +1,20 @@
+shared_examples 'a field that supports custom branding' do
+  let(:default_brand) { 'govuk' }
+  let(:custom_brand) { 'globex-corp' }
+
+  before do
+    GOVUKDesignSystemFormBuilder.configure do |conf|
+      conf.brand = custom_brand
+    end
+  end
+
+  after { GOVUKDesignSystemFormBuilder.reset! }
+
+  specify 'should contain the custom branding' do
+    expect(subject).to match(Regexp.new(custom_brand))
+  end
+
+  specify 'should not contain any default branding' do
+    expect(subject).not_to match(Regexp.new(default_brand))
+  end
+end
diff --git a/spec/support/shared/shared_text_field_examples.rb b/spec/support/shared/shared_text_field_examples.rb
index 320b6dff..da664a3e 100644
--- a/spec/support/shared/shared_text_field_examples.rb
+++ b/spec/support/shared/shared_text_field_examples.rb
@@ -25,6 +25,8 @@
 
   it_behaves_like 'a field that supports hints'
 
+  it_behaves_like 'a field that supports custom branding'
+
   it_behaves_like 'a field that accepts arbitrary blocks of HTML' do
     let(:described_element) { 'input' }
   end