enemy agents and turning them into double agents, had discussed the best method of capturing Chapman without revealing Ultra. In the end, Operation Nightcap was envisioned: Rather than conduct a full-scale manhunt, planes from RAF Fighter Command would trail Chapman's aircraft to identify his landing site (from one of three possible options). Local police would then be alerted, with instructions to conduct a search under the guise of looking for a deserter. However, these plans proved unnecessary; Chapman surrendered to the local police shortly after landing and offered his services to MI5. He was interrogated at Latchmere House in southwest London, better known as Camp 020. MI5 decided to use him as a double agent against the Germans and assigned Ronnie Reed as his case officer (Reed, a former BBC engineer, had been invited to join MI5 in 1940 and remained there until his retirement in 1976). Faked sabotage of de Havilland factory During the night of 29–30 January 1943, Chapman with MI5 officers faked a sabotage attack on his target, the de Havilland aircraft factory in Hatfield, where the Mosquito was being manufactured. German reconnaissance aircraft photographed the site, and the faked damage convinced Chapman's German controllers that the attack had been successful. To reinforce this story, MI5 also wrote and had published a story in the British newspaper the Daily Express. Following the de Havilland subterfuge, B1A began preparations for Chapman's return to his German handlers. Radio messages were sent to the Abwehr requesting extraction by boat or submarine, and Chapman was set to work learning a cover story ready for the inevitable interrogations. However, the response from the Abwehr was lukewarm. They refused to send a U-boat and told Chapman to return via Lisbon, Portugal. This was not a simple method, as he had no valid reason to travel to the neutral port. Reed, and other members of B1A, believed this demonstrated the Germans' reluctance to pay Chapman the £15,000 he had been promised. In the meantime Chapman was subjected to fake interrogation at Camp 020, to make sure his story held up. Reed told him to stick as close to the truth as possible, to help make the lies more realistic, and he was coached in speaking slowly to cover any hesitations. Stephens was impressed with how well Chapman responded to questioning. Portugal and Operation Damp Squib MI5 was eager for Chapman to return, hoping that