A 4,000-lb GP Bomb is hoisted from its trolley during operational trials at Marham, Norfolk. It entered general service with Bomber Command squadrons in early 1943, but proved inferior to the 4,000-lb HC Bomb in its blast effect and was withdrawn from service by the end of the year. In the background Vickers Wellingtons of No. 115 Squadron RAF can be seen parked at their dispersals.
