B57 Nuclear Bomb
Mr Neptunus Rex sir, while the British atomic weapons may have disappeared from the RAF inventory in the late 60's ...
A brief google discovered this ...
"The B57 could be deployed by most U.S. fighter, bomber and Navy antisubmarine warfare and patrol aircraft (S-3 Viking and P-3 Orion), and by some U.S. Navy helicopters including the SH-3 Sea King. The B57 was also deployed with Canada's CF-104s in Germany, and the Royal Air Force's Nimrod from RAF St Mawgan and RAF Kinloss in the UK and Malta in the Mediterranean."
I seem to recall it being said that it would take a weapon of this type to crack the hull of some of the Titanium hulled boats we used to chase around after.
also,
there were a number of other weapon types available to be carried by Nimrod's but which were not used - like the sea mines, (the name of which escapes me for the moment)