It would have been fun to witness this, this past week:

Britain’s Oldest Working Computer Roars to Life



The oldest original working computer in the U.K., which has been in storage for nearly 30 years, is getting restored to its former glory.

The Harwell computer, also known as WITCH, is getting a second lease on life at the National Museum of Computing at Bletchley Park. The machine is the oldest surviving computer whose programs, as well as data, are stored electronically, according to the museum.

The Harwell WITCH is a relay-based machine that used 900 Dekatron gas-filled tubes, each of which could hold a single digit in memory. It has paper tape for both data input and program storage. The computer was used in the design of Britain’s first nuclear reactors....

http://www.wired.com/gadgetlab/2009/09/britan-oldest-computer/