This is a compilation piece, written in part by my son Stuart when he was a schoolboy.
As a teenager Stuart interviewed my Dad as part of a school history project.
There is also a wonderful chap called Mike Kemble who is an amateur naval historian.
The additional material in this piece is from his website:
May I suggest that you also read “Sybil’s War” which is based on the ‘facts’ of what the submarine HMS Sybil did during WW2.