Annie Mole's, webmaster of Going Underground, daily web log (blog).
If you like this you'll LURVE One Stop Short of Barking, THE fun and informative BOOK about travelling on the London Underground.
If you know the area, this one is pretty easy. But I'm banking that a number of you looking at this right now won't! Obviously I'll be proved wrong and the first person to comment will probably know where it is.
Anyway, if you're guessing, try not to look at the comments before when you make your guess. Thanks!
"The magic, mystery & sometimes maddening shortcomings of London's Tube are documented with love, enthusiasm & sometimes despair by its unofficial social historian." The Guardian