He didn't live in the UK - Eire hasn't been British since 1922. Undoubtedly he left Eire to avoid their high socialist taxes - many move to the UK which has the lowest taxes in the EU, but he didn't and has never been a UK citizen.
Sorry. That's what I get for reading history books for current events...
From what I have read about him...His mother, May, was 19 when she gave birth to him. She had married his father, Thomas, on August 16, 1952. However, his parents separated when he was still a baby, and from the age of 4 he was raised by his maternal grandparents, Philip and Kathleen Smith, while his mother went to London to train as a nurse. When he was 6, both grandparents died and he was passed around amongst relatives until Eileen Reilly took him into her lodging house. Finally, when he was 10, his mother was able to take him to her home in Putney, London.
I don't know what country he is a citizen of. My sad guess is he probably has US citizenship....