Is Bletchley Park worth a visit?

Bletchley park has the main villa and some of the actual buildings with some props and setups. It has also a type of museum (btw Turing's hack to make monopoly interesting...) Right next to it is the national computer museum it is a different entity and this is where the actual big equipment is such as the Colossus etc

Those two places are a great visit easily accessible from london by rail.

If you haven't read about the life on bletchley park I would suggest a guided visit.

I had the best visit ever because I was very very lucky. I had the best tour guide and I did not ask for it. And he wasn't really a guide, just a very old person full of energy who used to work there and could walk for hours around showing stuff. And every one working in bletchley knew who he was. I didn't.

I haven't actually been to Bletchley Park, which I consider to be a personal tradgedy.

There's some very old school computing equipment in the Science Museum: https://en.wikipedia.org/wiki/Science_Museum,_London definitely worth a visit in my opinion.

I would also try to find the London Hackerspace for a tour, usually some interesting things going on there.

I live in Milton Keynes, just across town from Bletchley Park. It’s pricey, but a great geeks day out - there’s a lot to see and the demo of the reproduction Bombe device is fascinating. Also, though it’s a separate admission charge, there’s the National Museum of Computing on the same site with a heady mix of 80s home computers and rebuilt early computers. Don’t miss it!