[UK / NHS] Trying to get proof of vaccination for international travel without sharing all my data

I'm aware that for going to Australia I need some proof of vaccinaton.

When I try to sign up to access the NHS Covid Pass service I'm asked to:

> To continue, you need to agree to share your NHS login information with NHS COVID Pass. This service is provided by the Department of Health and Social Care.
>
>NHS COVID Pass will use your:
>
> - NHS number
> - date of birth
> - last name
> …

data international nhs privacy sharing travel uk vaccination