Originally Posted by
fartoomanyusers
this reminds me of discussions about the Common Travel Area ... how do you prove that you aren't an alien (and therefore don't need to show a passport) ... other than by showing your passport ?!
Presumably the same way you prove to HMPO that you are entitled to a British passport if you've never had one before (or the Irish equivalent)
A driving licence showing birth in the UK before 1983 or on the island of Ireland before 2005 would generally mean that the holder is a British or Irish citizen, but this isn't true in all cases (father was a foreign diplomat / citizenship renounced / citizenship revoked - could happen to people convicted of terrorism who have another citizenship)