Am due to bring my 13 year old son to london in May and apart from the obvious (Madame tussauds / natural history museum / thames duck tour etc) - does anyone have any suggestions of where to stay / what to ? He's interested in the 'usual' stuff dinosaurs /spies / military but we HAVE done a few things already..... And I'd like to stay somewhere 'different' with him - any ideas ladies ?