The Admiralty Civilian Shore Wireless Service (ACSWS) was a radio service and network of wireless stations operated by the British Royal Navy based at Irton Moor, Scarborough, North Yorkshire, England from 1939 to 1956.

In 1932, a proposal was made to close Scarborough, and to transfer operations to Flowerdown, Hampshire; fortunately this decision was reversed and in 1935 our interception of the German Navy was restarted.

At the beginning of August 1939, Y Service, the organisation responsible for intercepting enemy and neutral radio transmissions, were prepared for war.

During May 1941, the station at Scarborough played a key role in the location and subsequent destruction of the German battleship Bismarck.

WR Rodger, Officer in Charge, Scarborough, 15 November 1945:[3] Post World War II the Admiralty Civilian Shore Wireless Service role was monitor and collect communications of the Soviet Armed Forces a role it maintained through the cold war period.