Bletchley park home to the WWII code breakers ,makes for a very interesting day out if you close enough.All the work carried out there was top secret.Workers were recruited by The Times crossword special competitions ,others came from Oxford teaching posts .Some of the original buildings are still there including Bletchley park house.
I read a book all about the set up ,the enigma machines,the spies that were caught the double spies ,and the staff ,so had to go and see the place for myself.