Re: In AirPod Pro 2, the 'Hearing Assistance' feature (including ‘Set up hearing aid’) is not available in some countries, including the UK.
In 2024: Apple rolled out the test and feature to all those countries whose regulatory authorities approved their use. It was in use in over 100 countries last year.
Approvals from late-comer countries are responded to via Apple's OS updates. Seems those countries are then appearing on the list: AirPods Pro 2 - Hearing Health Feature Availability - Apple
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Re: Does anyone know if / when the hearing assistance function will be available here in the UK?
No. Rumours may abound. UK is not the only country waiting to receive the software features.
We are all Apple users, like yourself, in the community. As far as I know, Apple does not announce ahead of time the details of it's advance-planning for OS updates.
Seems patience is required, both with a country's regulatory authorities, and with Apple. Apple does seem to be carefully responding to the approvals when given, and releasing hearing health features along with other advance-planned update features. Although for some, it's not quickly enough, am grateful to see Apple is continuing gradually to include late-comer countries.