"Aircraft of the Royal Air Force 1939-1945- De Havilland Dh 98 Mosquito." Mosquito FB Mark XVIII, NT225 ‘O’, of No. 248 Squadron RAF Special Detachment based at Portreath, Cornwall, banking away from the camera while in flight, showing the 57mm Molins gun mounted underneath the nose. This version is sometimes referred to as the ‘Tsetse’.