How long do you have
And which part of London are you in? I would recommend going to the National Gallery and having a look round to kill some time.
( Lord Gnome, Fri 12 Jan 2007, 13:15, archived)

ime ramps
( the mighty badger Aphrodite, on a bar stool, by your side, Fri 12 Jan 2007, 13:16, archived)

Somewhere nearish Waterloo

( Woking Girl, Fri 12 Jan 2007, 13:18, archived)

Take a ride on the London Eye in that case
That's not far from there.

[Edit] Ignore that- it's closed until next week.

[Edit] Try the London Aquarium instead then.
( Lord Gnome, Fri 12 Jan 2007, 13:22, archived)