Firstly thanks again for all the info; I've added all the info posted and I now info up to 1940. He passed exams in 1940 and in 1941 he was involved in convoy and mine-sweeping work until his ship was attacked in August 1941. He was evacuated to Cambridge after his hospital on the south coast was bombed. I know nothing of his war service after that.
I'm trying to find the ships that he served on. Is there a website where I can search for his service records? I now have Ancestry but nothing on there.