No such thing as iPod Pro 2. iPods are music players not hearing aids.
Do you perhaps mean AirPods? AirPods and iPods are very very different things.
Apple has not released any statement regarding why the AirPod hearing aid feature is not yet available in the UK.
Not sure how you determined the UK government is happy about it or has given their authorization for. Since it's considered a health related devices it needs to be approved by the health authority.
Keep an eye on Apple's Feature website for updates.
click here ➜ AirPods Pro 2 - Hearing Health Feature Availability - Apple