Abandoned. Port outer engine out. Veg jettisoned and set course for return on three engines. On crossing coast of Denmark aircraft was illuminated in searchlights and flying low struck the sea. Both starboard props were bent and starboard inner was feathered. Preparations made for ditching and TR1335 and IFF destroyed. Aircraft continued to fly. All ammunition and Oxygen bottles jettisoned. Fire started from a short circuit in anti-fighter flare shute. Reached base.