[renw0rp]

National museum of computing [0] in Bletchley houses a rebuild of the Colossus computer. The people who volunteer there are great and always happy to explain the history.

PS. Bletchley is around an hour on the train from London Euston. Bear in mind that even though the museum of computing is located in the old Bletchley park complex, it requires a separate ticket from the main Bletchley Park museum.

[0] https://www.tnmoc.org/colossus

[AndrewOMartin]

The rebuild sourced the parts from other contemporary machines, and there's a decent chance some of these components came from the dismantling of the original Colossus, so some of the rebuild is probably also original :)

[mhh__]

The computer museum is much much better than the bletchley bit, although I suppose if you bothered to go to one you'd always go to the other anyway.