How many people know this though? Next election thousands of people will turn up at polling stations across the country and be turned away because they don't have ID on them.
I've received two lots of post through my door in the past week on the next council elections in May, both checking who is on the electoral roll and on the ID required to vote in person. It also gave a separate element on the same document on what you can do if you don't want or haven't got ID in terms of a postal vote or dropping the vote off at a local polling station.