I once had a few drinks with David Bernstein while chatting about his Man City days. He was a really nice guy and a proper football man. Stood his round too!
Also met Ben Kay at a function (another nice bloke) and could have met Clive Woodward at another event but decided not to bother having heard him speak earlier in the day - the most obnoxious, egocentric speaker I've ever heard. I once met Phil Neal while in hospitality at Anfield and tried to strike up a conversation about the Cobblers but he was a miserable bugger!
On top of that I've seen Alex Ferguson at Euston Station, David Coulthard shopping at Bicester village, Robbie Williams and Sinitta shopping in Selfridges (not together) and Rickaaay from Eastenders p1ssing it up in Northampton (several times, actually)
Tenuously, I went to the same lower school as Alan Moore's daughter. I remember my mum saying he "drew cartoons or something"
Seeing Geoff Hurst mentioned, my mate has a good story about him. He used to work in sporting hospitality and had met Geoff Hurst on a number of occasions. As others have said, my mate confirms that while he'll turn up to anything if he's paid to be there he's hardly the life and soul of the party when he's there. Suffice to say, my mate wasn't exactly keen to speak to him again, but saw him chatting to another footballing luminary of a lesser stature who my friend had never met (I honestly can't remember who he said it was). My mate wandered over, autograph book in hand and waited politely for the chance to ask for the other guy's autograph. Hurst clocked him standing there, tutted, rolled his eyes and snatched the autograph book from him, scrawling his name in it before thrusting it back to my mate without saying a word. When my friend didn't move, Hurst turned back to him and said "What?!" at which point my friend uttered the immortal line "Actually, I didn't want your autograph, I wanted his."
Geoff really wasn't amused but it seemed to make the other bloke's day!