bletchley park

'.. as important a strategic victory as .. Midway .. or .. Stalingrad' (John Winton)On 9th May 1941 the destroyer HMS Bulldog, escorting Atlantic convoy OB318, forced to the surface U-110. As the U-boat's surviving hands were hustled below, Sub Lt Balme boarded the the submarine, and searching...

This is much more than a biography of Alexander ('Alastair') Guthrie Davidson ('AGD'), 1881-1961, wheelhorse of the British Signal Intelligence (SIGINT) effort at the start of Hitler's War. It is also the story of SIGINT itself from 1914 onwards. It starts with the WW1 story of Room 40 under...

This is a history of the Operational Intelligence Centre of the RN's Naval Intelligence Division in WW2, and its satellite the Submarine Tracking Room. The author was an early recruit to the OIC and brings this story to us as an informed insider rather than a speculative journalist. In compiling...