diff --git a/app/views/govuk_web_banners/_emergency_banner.html.erb b/app/views/govuk_web_banners/_emergency_banner.html.erb
index fae038d..83734c9 100644
--- a/app/views/govuk_web_banners/_emergency_banner.html.erb
+++ b/app/views/govuk_web_banners/_emergency_banner.html.erb
@@ -1,4 +1,4 @@
-<% emergency_banner = GovukWebBanners::EmergencyBanner.new(redis_client: Rails.application.config.emergency_banner_redis_client) %>
+<% emergency_banner = GovukWebBanners::EmergencyBanner.new %>
 <% if emergency_banner.active? %>
   <%= render "govuk_publishing_components/components/emergency_banner", {
       campaign_class: emergency_banner.campaign_class,
diff --git a/lib/govuk_web_banners/emergency_banner.rb b/lib/govuk_web_banners/emergency_banner.rb
index 0ba0e2f..41a9ceb 100644
--- a/lib/govuk_web_banners/emergency_banner.rb
+++ b/lib/govuk_web_banners/emergency_banner.rb
@@ -5,8 +5,8 @@ module GovukWebBanners
   class EmergencyBanner
     attr_reader :campaign_class, :heading, :short_description, :link, :link_text
 
-    def initialize(redis_client:)
-      content = content_from_redis(redis_client)
+    def initialize
+      content = content_from_redis
 
       @campaign_class = content[:campaign_class].presence
       @heading = content[:heading].presence
@@ -21,9 +21,13 @@ def active?
 
   private
 
-    def content_from_redis(client)
+    def redis_client
+      Rails.application.config.emergency_banner_redis_client
+    end
+
+    def content_from_redis
       Rails.cache.fetch("#emergency_banner/config", expires_in: 1.minute) do
-        client.hgetall("emergency_banner").try(:symbolize_keys)
+        redis_client.hgetall("emergency_banner").try(:symbolize_keys)
       end
     rescue StandardError => e
       GovukError.notify(e, extra: { context: "Emergency Banner Redis" })
diff --git a/spec/units/emergency_banner_spec.rb b/spec/units/emergency_banner_spec.rb
index 031ef2e..515bdce 100644
--- a/spec/units/emergency_banner_spec.rb
+++ b/spec/units/emergency_banner_spec.rb
@@ -1,6 +1,9 @@
 RSpec.describe GovukWebBanners::EmergencyBanner do
-  let(:redis_client) { double(hgetall: {}) }
-  subject(:emergency_banner) { GovukWebBanners::EmergencyBanner.new(redis_client:) }
+  subject(:emergency_banner) { GovukWebBanners::EmergencyBanner.new }
+
+  before do
+    Rails.application.config.emergency_banner_redis_client = double(hgetall: {})
+  end
 
   describe "caching" do
     context "with a Rails cache" do
@@ -8,15 +11,15 @@
         allow(Rails).to receive(:cache).and_return(ActiveSupport::Cache.lookup_store(:memory_store))
         Rails.cache.clear
 
-        GovukWebBanners::EmergencyBanner.new(redis_client:)
-        GovukWebBanners::EmergencyBanner.new(redis_client:)
+        GovukWebBanners::EmergencyBanner.new
+        GovukWebBanners::EmergencyBanner.new
 
-        expect(redis_client).to have_received(:hgetall).once
+        expect(Rails.application.config.emergency_banner_redis_client).to have_received(:hgetall).once
 
         travel_to(Time.now + 61.seconds)
 
-        GovukWebBanners::EmergencyBanner.new(redis_client:)
-        expect(redis_client).to have_received(:hgetall).twice
+        GovukWebBanners::EmergencyBanner.new
+        expect(Rails.application.config.emergency_banner_redis_client).to have_received(:hgetall).twice
 
         travel_back
       end
@@ -31,7 +34,9 @@
     end
 
     context "with the emergency banner active" do
-      let(:redis_client) { double(hgetall: { heading: "Emergency!", campaign_class: "notable-death" }) }
+      before do
+        Rails.application.config.emergency_banner_redis_client = double(hgetall: { heading: "Emergency!", campaign_class: "notable-death" })
+      end
 
       it "returns true" do
         expect(emergency_banner.active?).to be true
@@ -40,7 +45,9 @@
 
     context "if the call to Redis fails" do
       before do
+        redis_client = double
         allow(redis_client).to receive(:hgetall).with("emergency_banner").and_raise(StandardError)
+        Rails.application.config.emergency_banner_redis_client = redis_client
       end
 
       it "returns false" do