As per thread title, who have you randomly seen?
My list:
John Betjemen - on the Southend Pier train
John Cooper Clarke - used to see him around and about in Southend years ago, and more recently getting on a train in Colchester
Bill Clinton - in Harrods
Fish era Marillion - in the upper circle at the Hammersmith Odeon. Dont remember who was on
John Peel and The Pig - in a pub, having a Sunday Roast
Queen Elizabeth II - being driven along the Euston Road
Tony Blair -pre-leadership, on one of Blackpool's piers (must have been Labour Conference)