I got the paper letter version that they post to the address on file on request so you don't need to provide any ID at all.
I've tried twice to get this and so far have heard nothing from them.
Came through in under a week for both my other half and me. Perhaps your address is different on some NHS system somewhere? Can you check that bit with your GP?
@hippy started
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I got the paper letter version that they post to the address on file on request so you don't need to provide any ID at all.