As someone nerdishly but amateurishly interested in transport, infrastructure and design I enjoyed the history of the tube’s expansion, its developing visual identity and the parallel list of inventions (Nylon, Spam, Frisbees, helicopters) that illustrate the zest for progress of the Thirties, early Forties and late Fifties. I quite liked the recreation of Beck’s map with coloured ribbons criss-crossing the vestigial set, though it’s done for easy laughs.