Underground, Overground

Wombleing Free. Alright, so I didn't actually go anywhere near Wimbledon, but I did see plenty of the Underground on my way back to Bristol from doing my exhibition in Cambridge (thanks to everyone who came).  I also got told off for trying to take a picture inside Paddington. Apparently the only part of the station you're allowed to photograph is Platform 1, though I'm not sure I understand the logic behind this....