The UK has no formal universal government provided ID system. The UK does allocate National Insurance numbers, but those are specifically not to be used as ID in part because they don't have a face associated with them. Driving licenses exist but are optional, and need regular replacement e.g. when moving address. Names are something you can change on a whim for a bet. Passports have to be updated if your appearance changes significantly, and in any case you don't keep the same one if you change nationality.