It was some years ago now, but an ex colleague who possessed no passport or driving licence, was executor for an old uncle. Of course she had to visit banks etc. to wind up his affairs, and staff repeatedly insisted that they must see passport or DL as ID.
She was a quietly forceful and determined type, and maintained continuously that since it was not a legal requirement in the U.K. to possess such ID, they had no legal right to demand it.
In the end they had to give in - I forget what they accepted in the end - probably the ID badge with photo she wore at work.