He was watching the Dodgy "Dodgy" gig at the Astoria on Saturday 31st of March... also Mark Thomas was there, but he was on stage, so that doesn't count... he was mercilessly heckled (Mark, not Gem) by a drunken twat.
Celebrity spotting action, not actual stalking. Got to catch them all! Originally a popular feature of my site popex.com. 99% written by other people. Hopefully now with some bonus location content.