ICL had a Historical Collection on computing on Cavendish Road, Stevenage. This was a collection of material from ICL and the companies that formed it, e.g. British Tabulating Machines, Powers Samas and English Electric. The collection includes a replica of Hollerith's 1890 US Census equipment. I have seen a note indicating that this collection has been donated to the Science Museum in London.
To see an Ordnance Survey map click at
An extract from
The Mathematical Gazetteer of the British Isles
created by David Singmaster
The original site is at