I watched in the hope that HMS Torrin wouldn't be sunk this time but she was. Mind you, I had forgotten that Cdr(E) was played by Ballard Berkeley (the Major in 'Fawlty Towers') and that Freda's baby was played by John Mills' real daughter, Juliet.
This was shown to us our first week at Dartmouth. The Chief GI there in those days (of course the first one of his type we had met) was a fifth-fiver who had been torpedoed twice. Subliminal msg, 'if you can't take a joke you shouldn't have signed on'.