A bit off the wall, but If you like gaming then It might be worth a trip to the GAME ON exhibition at the barbican.
It's a celebration of all things computer gamery, from PONG (and SpaceWar for those that remember) to GTA3 and some future type stuff - amazing exhibition, but you only get a couple of hours..
.. oh .. and you get to PLAY all the games on original hardware!!
Well, it amused me.
http://www.gameonweb.co.uk (book online, you need to book unless going during the week)
Only on until the 15th Sep though, so might be too late.
Paul