Our cookie banner has an accessible description
but no accessible name. It needs to have an
accessible name to distinguish it from other
elements on the page with role=region.
There's some advice in the WCAG guidance that
explains this more:
https://www.w3.org/TR/WCAG20-TECHS/ARIA11.html
This issue was raised in the accessibility review
done as part of our service assessment.
These changes borrow the approach from www.gov.uk of
moving to a label and losing the accessible
description. It also uses the 'cookie banner'
label for consistency with www.gov.uk.