What can I do in London on Sunday evening?

[Fourarmsv2]

DH and FIL are going to see Monty Python at the O2. Any ideas for keeping an 8 and 10 year old occupied?

I'd hoped to go to the cinema nearby but there's nothing suitable showing :(

Go over the river on the cable car go to greenwich, look at the cutty sark, go up the river on the river boat.

Cable car sounds a good idea, will look at opening times. Thanks :)

Any more?

I've changed my tesco vouchers for Ripley's believe it or not tickets as it's open until 11pm.