Reinstate storybook upgrade

package.json

@@ -151,19 +151,19 @@
     "@emotion/jest": "11.13.0",
     "@loadable/babel-plugin": "5.16.1",
     "@loadable/webpack-plugin": "5.15.2",
-    "@storybook/addon-a11y": "8.5.6",
-    "@storybook/addon-backgrounds": "8.5.6",
-    "@storybook/addon-controls": "8.5.6",
-    "@storybook/addon-docs": "8.5.6",
-    "@storybook/addon-toolbars": "8.5.6",
-    "@storybook/addon-viewport": "8.5.6",
-    "@storybook/blocks": "8.5.6",
-    "@storybook/builder-webpack5": "8.5.6",
-    "@storybook/cli": "8.5.6",
-    "@storybook/core-common": "8.5.6",
-    "@storybook/react": "8.5.6",
-    "@storybook/react-webpack5": "8.5.6",
-    "@storybook/theming": "8.5.6",
+    "@storybook/addon-a11y": "8.6.4",
+    "@storybook/addon-backgrounds": "8.6.4",
+    "@storybook/addon-controls": "8.6.4",
+    "@storybook/addon-docs": "8.6.4",
+    "@storybook/addon-toolbars": "8.6.4",
+    "@storybook/addon-viewport": "8.6.4",
+    "@storybook/blocks": "8.6.4",
+    "@storybook/builder-webpack5": "8.6.4",
+    "@storybook/cli": "8.6.4",
+    "@storybook/core-common": "8.6.4",
+    "@storybook/react": "8.6.4",
+    "@storybook/react-webpack5": "8.6.4",
+    "@storybook/theming": "8.6.4",
     "@testing-library/dom": "10.4.0",
     "@testing-library/jest-dom": "6.6.3",
     "@testing-library/react": "16.2.0",