£3 for parking, £12 for adults and an extra £2 to see a big whirring machine.
What you get is one floor about the various cipher machines and code breaking work done during the war, and one floor containing any old ww2 tat they could find, completely unrelated to cryptography.
That's it, unless you count the PC museum (which was closed), a radio exhibition (now permanently closed) and a collection of model boats and some old cars.
It desperately needs a major overhaul. Interactive displays and games to engage visitors? Teach kids to make & crack codes? Give us some examples of successful war actions that were a RESULT of all this code breaking, rather than concentrating on repetitive technical descriptions of how a cipher machine works (which you probably won't understand unless you're a maths/engineering whizz).
As others have said - it's ramshackle, run-down, un-engaging and worst of all - extortionately priced.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.