His main claim to fame before that was being Peter Wright’s right-hand man. Wright’s “Spycatcher”, talks of their joint exploits over the years. I got to ask Tony about it once, he was not too impressed Wright had done what he had done by writing that book.
Same in the US. It's why computers live in 19-inch racks.
If you consider the NMC "just up the road" then the Bletchley Park site you're thinking of is also "jump up the road" from er, Bletchley Park, a stately home that's less interesting to a nerd than either the NMC or Bletchley Park museum about war era "intelligence" but might be fascinating if period furniture is more interesting to you than the world's first (for many different values of first, the museum has several options, but not all of them) programmable computer.
although i just looked. critically they have different ticket offices. it was a long time ago! either way, worth a visit of both and they make up an excellent way to spend a day.
Don't ask me how I know...
See Influence and Fate: https://en.wikipedia.org/wiki/Colossus_computer
It's Tommy Flowers I always felt sorry for, after the war he wanted a loan to build a computer was refused on the grounds that what he wanted to build was impossible. He knew it was possible but couldn't disclose that due to secrecy laws