Earlier quoted context omitted.
Visitors might want to be a bit patient on the guided tour - largely seems a waste of time initially, with the guide talking a lot about the history of the land/park itself, and the WW2/code-breaking info being somewhat superficial. Then he takes you into the National Museum of Computing and demonstrates the machines, and sometimes lets you touch and feel as well - awesome! The guided tour ends on quite the high!
depends on the guide I guess, I've been there about 4 times (used to live just down the road, and the ticket is for a whole year!) and took the tour twice, the code-breaking content wasn't highly technical, but it was covered in a decent amount of depth I felt. Riddle from the tour: What must you add to nine to get six? (and no, it's not -3)
Gur nafjre vf f. avar va ebzna ahzrenyf vf vk, nqq na f naq lbh trg fvk ;)