I found a fantastic 3 volume series entitled 'Wonderful London' edited by Arthur St John Adcock.
I think it's published in about 1926-7 and is full of the most remarkable pictures. In particular, you are able to get a feel for what Victorian London was like as so little had changed whereas come the 40s and the Luftwaffe, things are gone forever.
Absolutely delightful and the kind of book that you can just flick through, charmed by the photos and ignoring the rather deathless prose.
I tried to track down a few images from the net but couldn't find any, I'll look again.
Oh and i got it in a jumble sale for about a quid for all three volumes - it may well be my ultimate book bargain.