We hit the shops too, in Covent Garden and Carnaby Street etc. and despite us both having a great time we still left feeling a little frustrated because we'd only touched upon places we'd like to visit. I think the long list grew after coming back from London and the desire to go back soon was rather strong!
We did treat ourselves a lot, especially when it came to tea and cake (big up the British Museum for having great London Company tea in silky bags, yum!). I also bought myself the "This is London" childrens book by M. Sasek. It was a must right?