The Science Museum has some good stuff if you can get past the gaudy plastic displays lecturing you on CO2 emissions. ISTR the best stuff is mostly rocks, which the Natural History museum has more of. The Natural History is obviously in the best building and it has the best chocolate muffins. The British Museum is full of tourists and in any case should be rename the British Colonial Lootings Museum. The London Museum and thought it was good but I can't remember a single thing about it so maybe it was just average. The War Museum I don't I've never managed to get to.