Deprecate colour $nhsuk-border-hover-colour (duplicated)

Author: colinrotherham

packages/nhsuk-frontend/src/nhsuk/components/card/_index.scss

@@ -35,7 +35,7 @@
 $nhsuk-card-border-width: 1px;
 $nhsuk-card-border-bottom-width: nhsuk-spacing(1);
 $nhsuk-card-border-colour: $nhsuk-border-colour;
-$nhsuk-card-border-hover-colour: $nhsuk-border-hover-colour;
+$nhsuk-card-border-hover-colour: $nhsuk-secondary-border-colour;
 
 // @deprecated To be removed in v11.0
 $card-border-width: $nhsuk-card-border-width;

packages/nhsuk-frontend/src/nhsuk/components/details/_index.scss

@@ -22,7 +22,7 @@
 $nhsuk-expander-border-width: 1px;
 $nhsuk-expander-border-bottom-width: nhsuk-spacing(1);
 $nhsuk-expander-border-colour: $nhsuk-border-colour;
-$nhsuk-expander-border-hover-colour: $nhsuk-border-hover-colour;
+$nhsuk-expander-border-hover-colour: $nhsuk-secondary-border-colour;
 $nhsuk-expander-icon-size: 27px; // 19px font size + 4px summary text padding
 
 // @deprecated To be removed in v11.0

packages/nhsuk-frontend/src/nhsuk/core/core.unit.test.mjs

@@ -51,9 +51,9 @@ describe('Core', () => {
         --nhsuk-error-colour: #d5281b;
         --nhsuk-success-colour: #007f3b;
         --nhsuk-border-colour: #d8dde0;
-        --nhsuk-border-hover-colour: #aeb7bd;
         --nhsuk-secondary-border-colour: #aeb7bd;
         --nhsuk-reverse-border-colour: #337ec6;
+        --nhsuk-border-hover-colour: #aeb7bd;
         --nhsuk-input-border-colour: #4c6272;
         --nhsuk-hover-colour: #aeb7bd;
         --nhsuk-input-background-colour: white;

packages/nhsuk-frontend/src/nhsuk/core/settings/_colours-applied.scss

@@ -107,12 +107,6 @@ $nhsuk-success-colour: nhsuk-colour("green") !default;
 
 $nhsuk-border-colour: nhsuk-colour("grey-4") !default;
 
-/// Border hover colour
-///
-/// @type Colour
-
-$nhsuk-border-hover-colour: nhsuk-colour("grey-3") !default;
-
 /// Secondary border colour
 ///
 /// @type Colour
@@ -125,6 +119,14 @@ $nhsuk-secondary-border-colour: nhsuk-colour("grey-3") !default;
 
 $nhsuk-reverse-border-colour: nhsuk-tint($nhsuk-brand-colour, 20%) !default;
 
+/// Border hover colour
+///
+/// @alias $nhsuk-secondary-border-colour
+/// @deprecated To be removed in v11.0, replaced by $nhsuk-secondary-border-colour
+/// @type Colour
+
+$nhsuk-border-hover-colour: $nhsuk-secondary-border-colour;
+
 /// Form border colour
 ///
 /// Used for form inputs and controls