I'm already a full licence holder, but if they won't renew it on medical grounds I can't get a another one for the same reason.
Polling stations accept bus passes, but the bank won't (necessarily), so I doubt that will cut the mustard.
If they don't accept photocopies I don't see why they would accept a scan on a screen. If I'm applying for a passport I've got the problem of finding someone who's known me for two years to sign the photo.
In this instance digital ID was the problem, but yes, it's time HMG stopped pandering to people who don't want ID cards.
A tax notification and a utility bill will do, but I don't want to have to carry them (or a passport) around everywhere just on the off chance that I need them once a tall time. It's about access to services at the point of need, not after it's too late. On this occasion I could make do with the £50 they would give me instead of the £100 the cheque was for, but that won't necessarily be the case.