After many decades or dereliction, then rebuilding – and a big promotion period – the Bletchley Park museum is extensive and fully open – this is where 1,000’s of workers cracked the German World War II codes in complete secret with of course the making of Alan Turing.

A new section, next to the core museum, is on data and visualisation . One installation shows density of cities – and although London is to some people ‘packed’ thanks to large amounts of open spaces, due to its unusual history, has a lower density than many similar mega-cities. London (far model) vs Hong Kong (near model) [pic from BP].