From the Haddon-Cave Nimrod review :-
2.38.1 Nimrod MR2 XV256: The first Nimrod to be lost in an accident was Nimrod MR2 XV256 on 17 November 1980. Shortly after take-off from RAF Kinloss, the aircraft flew through a dense flock of seagulls. Ingestion of a large number of birds into the engines caused a significant loss of power and the aircraft crashed in woods close to the airfield. Although, tragically, both pilots were killed in the accident, their skill in crash landing the aircraft ensured that their crew survived.
From 'RAF Commands.com' :-
1980 Nimrod Crash, Info wanted[RAFCommands Archive]
When I was at Kinloss in 1989, the crash of this particular a/c was still fresh in the memory. It is worthy of note that the crash site was still plainly visible in the trees at the time. It is my understanding that, after power was lost, the pilot attempted to ditch in the sea but never made it. I was also informed that a crew member ran quite a distance from the aircraft with a broken femur and that (if memory serves) 126 dead birds were found in the wreckage.