I met Mark Knopfler a couple of times, in the course of my work, and he was lovely. I met Eric Clapton, same job, also Lovely. David Bowie was an absolute delight, very chatty and funny.
I found Tony Robinson to be quite abrasive, Phil Harding was downright rude and Professor Mick Aston was brilliant. Also guesting on Time Team, Sandi Toksvig who I would cross lava to chat to again, she was wonderful.
I also managed to have met, through work, Ainsley Harriott who was fantastic fun, Hugh Fearnley-Whittingstall, very abrupt. I had no idea who he was and feel he was not happy about it. Ron Pearlman was very pleasant, Joanna Lumley was charming and seemed to be genuinely interested in people she was speaking to, as was George Harrison. I also met Jimmy Carr and am in the charming camp with him. Also Matt Baker in his Blue Peter days. Connie and the other woman were less friendly but Matt was engaging and really interested in everyone.
None of the work roles were wildly high powered, I am a contracting administrator who has had a few good breaks with some short term-contracts. Had some properly terrible ones too.