High Quality Content by WIKIPEDIA articles! Allen William Mark (Doc) Coombs (23 October 1911 – 30 January 1995) was a British electronics engineer at the Post Office Research Station, Dollis Hill. He was one of the principal designers of the Mark II or production version of the Colossus computer used at Bletchley Park for codebreaking in WWII, and took over leadership of the project when Tommy Flowers moved on to other projects. The Post Office Research Station at Dollis Hill, London, was first established in 1921 and opened by Prime Minister Ramsay MacDonald in 1933. In 1943 the world's first programmable electronic computer, Colossus Mark 1 was built by Tommy Flowers and his team, followed in 1944 by nine Colossus Mark 2s. In 1957 ERNIE (Electronic Random Number Indicator Equipment) was built for the government's Premium Bond lottery, by Sidney Broadhurst's team.

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