The header with navigation throws the following warning in https://validator.w3.org/:

Possible misuse of aria-label.

This relates to

The WCAG specs state that aria-label can be used for:

• Distinguishing navigation landmarks
• Identifying region landmarks

We should review whether having aria-label in this context provides useful information for assistive technologies.

There is also a related issue where we hide the list inside the navigation element when showing/hiding the navigation. This means that a user can end up with an empty <nav></nav> element, which may cause issues/confusion for screenreader users. See comment for more context.

Done when

• TBC
• "Details of breaking change" section below completed to help with writing release notes

Details of breaking change

• which users are affected: TBC
• the change that’s been made: TBC
• changes users will have to make: TBC
• impact of users not making those changes: TBC