Yes go there but be aware of a slight subtlety.

Although the National Museum of Computing (TNMOC) is inside Bletchely park. It is a different organisation.

TNMOC has all the interesting computers and the Bletchely park trust has the land and buildings.

There is still a political battle going on between the two (which is sad). They put fences around TNMOC as though to keep people from wandering in there.

- I am a TNMOC member

Absolutely! I was just there a few weeks ago and I had the best time. There's displays of equipment from the 60's - today, but also several rooms with wartime electromechanical and electrical machines used by Bletchley Park to break Enigma and Lorenz. Incredible!

I second this. The most amazing thing to me is that they still keep many of those really old machines and peripherals: the Colossus and more, up and running.

It's one thing to see those historic computers on display, it's a whole new level seeing them running, producing heat and noise!