"Aircraft of the Royal Air Force, 1939-1945- Avro 683 Lancaster." Lancaster B Mark II, DS652 'KO-B', of No. 115 Squadron RAF, undergoing a test of its Bristol Hercules VI sleeve-valved radial engines in a dispersal at East Wretham, Norfolk. DS652 failed to return from a raid on Bochum, Germany on 12/13 June 1943.