The UK's Airborne Interception radar (AI) efforts were briefly housed at St Athan in late 1939 and early 1940. Prior to the war they had been located with the rest of the radar research efforts at Bawdsey Manor on the east coast, but with the opening of hostilities they were quickly moved to a tiny civilian airfield outside Perth, where they found the conditions entirely unsuited to their efforts. After a short search, St Athan was selected for the AI team while the rest of the researchers stayed in Dundee. When they too found the conditions unsuitable, both teams moved to Worth Matravers in May 1940.