Sinking submarines and bugging enemies may appear higher related to a spy novel than with BT. Yet two secret Second World War diaries from the telecoms company’s predecessor have revealed the important thing role it played within the fight against the Nazis.

The diaries — declassified in 2019 and now available online to the general public — shed latest light on the work undertaken in the course of the war.

They were kept by Sir Gordon Radley, head of the GPO Engineering Department’s Research Branch at Dollis Hill, northwest London, which was heavily involved in maintaining the safety of the country, including the usage of concealed listening devices.

A diary entry for March 18, 1941, written by hand since it was too secret to entrust to typists, depicts the success


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