What are the current features of AirPod Pro 2 in the UK?

If I purchase the AirPod Pro 2 now in the UK what are the views from the community that the hearing aid function could be turned on/made available as soon as they are approved by the MHRA? It's not a separate device for the UK is it? It's just a software approval and availability thing right? So I could purchase them now and use them with existing functionality and then get the added hearing aid functionality on the same device once approved?