I confess to not checking official data; but in the static park it appeared to be noticeably smaller than Poseidon (Boeing 737) which came as a surprise.
It is however purpose built as opposed to a bodged airliner; and appeared to have all the toys to be an effective MPA that can attack as well as discover. Best asset was just how quiet it was, and former kipper fleet work mates have explained why jets are superior to turboprops when sub hunting so it gets my vote. If I was operating on some of the less well known sorties that Nimrod did in its day; I would want four engines.