Oops! I beg Thomas and Robert (and Richard--anybody else?) Harris's pardon. I think I got confuse with Tom Stoppard, who wrote the screenplay. Honest! (Did a quick check on the 'net--a lot of folks out there seem to think R & T are the same person, or at least that one wrote both author's books.)

See here for more on Colossus. And whatever the ... (I'm trying very hard not to say 'Yanks'!) ... Americans say about ENIAC, we were definitely first with the electronic computer!

Churchill had it all broken up after the war, apart from one or two machines that went to GCHQ, so nobody would kow we could crack the codes--then he gave enigmas to all our allies, so we could read their secret transmissions, the sneaky old bugger. Can't see Our Tone being that Anglo-centric, can you? Oops--political thread creep--ignore this!
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Steve