Re: More proof of address
Sainsburys, by policy, won't accept a biometric residence permit (BRP) as proof of age or ID when trying to purchase alcohol. The BRP, which does state date of birth, is issued by the Home Office as your official ID for everything - right to work/study, to rent, open a bank account, etc - which you collect having arrived after successfully navigating the UK visa system.
But it's not good enough for Sainburys.