They weren't all destroyed, some were moved to what became GCHQ (UK's equivalent to the NSA)

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

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parpfish 3 hours ago | parent [-]

that's where they computed numberwang, right?

	▲	cadr an hour ago \| parent \| next [-]
		It was a huge advancement. Previously they were computing numberwang on slide rules.
	▲	cryo32 2 hours ago \| parent \| prev [-]
		That's wangernumb!