Found - in a paperback novel from the 1980s this press cutting. It is from a glossy magazine (possibly Electronics World) and is a letter from one G.O. Hayward. This is the war hero Gil Hayward who had worked at Bletchley Park and was given a medal by the Prime Minister in 2010 and died a year later aged 93. He had worked on the "Tunny" decryption machines at  at the Post Office Research Station at Dollis Hill, North London, and later at Bletchley Park. These were used to break the code of even higher grade secret messages than the Enigma machine. Towards the end of the war, up to 15 of the Tunny machines were in use at Bletchley Park, providing Allied leaders with around 300 messages from the German High Command a week. Among other things, Tunny provided key intelligence for D-Day. The Colossus computer was developed from it...

His Telegraph obituary notes that he was interested in electronics from an early age - "On his own motorcycle.. he built an indicator which integrated a clock with his speedometer and indicated his average speed.