This new museam will be showcasing examples & working examples of historic computer systems. Included will be an original fully working Colossus, used to decifer German codes during WWII.
http://news.bbc.co.uk/1/hi/technology/6895759.stm
Great stuff about Colossus Rebuild Project:
http://www.picotech.com/applications/colossus.html
This will be well worth a visit as soon as it opens for the public.