Now that we are in Milton Keynes we have learnt that the actual place that the movie is based on is here in Milton Keynes. Well actually it's Bletchley which is essentially part of Milton Keynes. Bletchley Park is open as a tourist site and is the original WW2 site where the Enigma code was broken. Now this may not make much sense if you don't know the story or haven't seen the movie.
In a nutshell it's where the British intelligence broke the "unbreakable" code of the the Germans Enigma code. It's where Alan Turing did his amazing work and built his "Christopher" that broke the code and allowed the Germans to be defeated and ended WW2.