diff --git a/lib/iris/analysis/calculus.py b/lib/iris/analysis/calculus.py
index 8d7d35d9c4..f1022187f8 100644
--- a/lib/iris/analysis/calculus.py
+++ b/lib/iris/analysis/calculus.py
@@ -443,7 +443,7 @@ def _trig_method(coord, trig_function):
     return trig_coord
 
 
-def curl(i_cube, j_cube, k_cube=None, ignore=None):
+def curl(i_cube, j_cube, k_cube=None):
     r"""
     Calculate the 2-dimensional or 3-dimensional spherical or cartesian
     curl of the given vector of cubes.
@@ -463,11 +463,6 @@ def curl(i_cube, j_cube, k_cube=None, ignore=None):
 
     * k_cube
         The k cube of the vector to operate on
-    * ignore
-        This argument is not used.
-
-        .. deprecated:: 0.8
-            The coordinates to ignore are determined automatically.
 
     Return (i_cmpt_curl_cube, j_cmpt_curl_cube, k_cmpt_curl_cube)
 
@@ -525,11 +520,6 @@ def curl(i_cube, j_cube, k_cube=None, ignore=None):
             where phi is longitude, theta is latitude.
 
     """
-    if ignore is not None:
-        ignore = None
-        warn_deprecated('The ignore keyword to iris.analysis.calculus.curl '
-                        'is deprecated, ignoring is now done automatically.')
-
     # Get the vector quantity names.
     # (i.e. ['easterly', 'northerly', 'vertical'])
     vector_quantity_names, phenomenon_name = \
diff --git a/lib/iris/analysis/maths.py b/lib/iris/analysis/maths.py
index f0c35e1235..abd6e3a633 100644
--- a/lib/iris/analysis/maths.py
+++ b/lib/iris/analysis/maths.py
@@ -31,7 +31,6 @@
 import numpy as np
 from numpy import ma
 
-from iris._deprecation import warn_deprecated
 import iris.analysis
 import iris.coords
 import iris.cube
@@ -225,7 +224,7 @@ def _assert_matching_units(cube, other, operation_name):
         raise iris.exceptions.NotYetImplementedError(msg)
 
 
-def add(cube, other, dim=None, ignore=True, in_place=False):
+def add(cube, other, dim=None, in_place=False):
     """
     Calculate the sum of two cubes, or the sum of a cube and a
     coordinate or scalar value.
@@ -265,10 +264,10 @@ def add(cube, other, dim=None, ignore=True, in_place=False):
     else:
         op = operator.add
     return _add_subtract_common(op, 'add', cube, other, new_dtype, dim=dim,
-                                ignore=ignore, in_place=in_place)
+                                in_place=in_place)
 
 
-def subtract(cube, other, dim=None, ignore=True, in_place=False):
+def subtract(cube, other, dim=None, in_place=False):
     """
     Calculate the difference between two cubes, or the difference between
     a cube and a coordinate or scalar value.
@@ -308,11 +307,11 @@ def subtract(cube, other, dim=None, ignore=True, in_place=False):
     else:
         op = operator.sub
     return _add_subtract_common(op, 'subtract', cube, other, new_dtype,
-                                dim=dim, ignore=ignore, in_place=in_place)
+                                dim=dim, in_place=in_place)
 
 
 def _add_subtract_common(operation_function, operation_name, cube, other,
-                         new_dtype, dim=None, ignore=True, in_place=False):
+                         new_dtype, dim=None, in_place=False):
     """
     Function which shares common code between addition and subtraction
     of cubes.
@@ -328,8 +327,6 @@ def _add_subtract_common(operation_function, operation_name, cube, other,
                            case of scalar masked arrays
     dim                  - dimension along which to apply `other` if it's a
                            coordinate that is not found in `cube`
-    ignore               - The value of this argument is ignored.
-        .. deprecated:: 0.8
     in_place             - whether or not to apply the operation in place to
                            `cube` and `cube.data`
 
@@ -342,14 +339,6 @@ def _add_subtract_common(operation_function, operation_name, cube, other,
         # operation with
         coord_comp = iris.analysis.coord_comparison(cube, other)
 
-        # provide a deprecation warning if the ignore keyword has been set
-        if ignore is not True:
-            msg = ('The "ignore" keyword has been deprecated in '
-                   'add/subtract. This functionality is now automatic. '
-                   'The provided value to "ignore" has been ignored, '
-                   'and has been automatically calculated.')
-            warn_deprecated(msg)
-
         bad_coord_grps = (coord_comp['ungroupable_and_dimensioned'] +
                           coord_comp['resamplable'])
         if bad_coord_grps:
diff --git a/lib/iris/cube.py b/lib/iris/cube.py
index efa8d4a34d..67c6aa8fa6 100644
--- a/lib/iris/cube.py
+++ b/lib/iris/cube.py
@@ -3078,19 +3078,18 @@ def __hash__(self):
         return hash(id(self))
 
     def __add__(self, other):
-        return iris.analysis.maths.add(self, other, ignore=True)
+        return iris.analysis.maths.add(self, other)
 
     def __iadd__(self, other):
-        return iris.analysis.maths.add(self, other, ignore=True, in_place=True)
+        return iris.analysis.maths.add(self, other, in_place=True)
 
     __radd__ = __add__
 
     def __sub__(self, other):
-        return iris.analysis.maths.subtract(self, other, ignore=True)
+        return iris.analysis.maths.subtract(self, other)
 
     def __isub__(self, other):
-        return iris.analysis.maths.subtract(self, other,
-                                            ignore=True, in_place=True)
+        return iris.analysis.maths.subtract(self, other, in_place=True)
 
     __mul__ = iris.analysis.maths.multiply
     __rmul__ = iris.analysis.maths.multiply