I dunno

Another day in London.

Natural History Museum (4 hours), then onto the science museum, then onto the cable car over the Thames, the DLR to Tower.
A walk over Tower Bridge (the hard way - see extras), then eventually (stupidly) the bus back to Hammersmith.

Two (three) very tired boys by the end of it!

This building was on the southbank of the Thames near Tower Bridge / City Hall, and I LOVE IT!.

Could anyone tell me what it is?
Actually, just location tagged it, and Google says its PWC.