not sure it would have been 39-47
Probably this place: Post Office Research Station - Wikipedia
Amongst other things responsible for:
- The first transatlantic radio telephone service.
- In 1943 the world's first programmable electronic computer, Colossus Mark 1, was built by Tommy Flowers and his team, followed in 1944 and 1945 by nine Colossus Mark 2s. These were used at Bletchley Park in Cryptanalysis of the Lorenz cipher.
- In 1957 ERNIE (Electronic Random Number Indicator Equipment) was built for the government's Premium Bond lottery, by Sidney Broadhurst's team.
- In 1971 Samuel Fedida conceived Viewdata and the Prestel service was launched in 1979.