Alastair Campbell is a decent guy, he gave a great answer to my question anyway and was polite to all of the 6th form and school kids at the book signing. Seen Judy Dench wandering around York as she does but never spoke to her.
I can add that David Batty (ex-Leeds United player) is a douche, I asked him to sign my Wiggington Football Tournament Book and he literally drew a squiggle, he was also not very talkative. Maybe didn't help that we'd just beat his nephews team at football though.