HEC 2M systems were delivered to customers who included GE Research Laboratories, Thorn, Esso, MoD Boscombe Down, Royal Aircraft Establishment and RAE, Bedford (they had two for wind tunnel applications) and the Indian Mathematical Institute. The next development was of a machine that was essentially a HEC 2 with a number of enhancements specifically designed for a commercial workload. This became known as the HEC 4. When in 1959 International Computers and Tabulators (ICT) was formed by a merger of the BTM and Powers-Samas, the HEC 4 became the ICT 1201 (1200 series). Some 100 of these machines were sold. Preservation The original HEC 1 appears to have spent some time in the ICL company museum before being transferred to the collection of Birmingham museums in 1972. After sometime on display, it was by 2002 in the Birmingham Museum Collection Centre at which point there was a proposal to lend it to Birkbeck College but this fell through. The National Museum of Computing made an approach to borrow the computer in 2014 and the computer was transferred on 12 October 2015. After being cleaned up it was officially unveiled in the presence of Dr Bird in April 2016. References Sources External links The BTM HEC Paperwork Collection at The ICL Computer Museum. Early British computers English inventions Vacuum tube computers