Recommendations for hardwired transformer for G400 doorbell

The only DIN rail transformer available from a popular DIY store here is a 8-24V AC 8VA - I know the PM said that 8V 1A (8VA?) might be sufficient but there doesn’t seem to be a conclusion for UK/Euro users IIRC.

I want to run it with Apple HomeKit Secure Video and it will be the only device coming from the transformer - not sure where >8VA will be needed.

Are there any UK users with a transformer they could recommend? I’ve found some on specialist electronics stores that are £100~ which seem overkill, and Amazon has a lot of generic products I’d like to avoid if possible.

Thanks

Apologies - to clarify I am in the UK