SS, quite. Mind you the Nimrod would not have been the first aircraft where jettison was a pre-landing requirement.
The old bomber ethos of course had been drop your bombs on target or jettison come-what-may.
I changed the Nimrod re-arm ethos for the aircraft to only reload a carrier when all torpedoes on that carrier had been expended, ie if a standard load out had been 6 or 9 torpedoes then a minimum load out could be 4 or 7 thus obviating the need to download a partially expended carrier, returning it to the dump and replacing it with a fully loaded one.
I don't know if that plan was continued in to the 80s.