PS Nacluv - He was a submariner (radio operator) during the war .... known in those days and until the early 1960s as a Telegraphist
Thanks Union Jack. You're quite right, and I had realised my 'howler' - and was intending to correct it.
Funnily enough, reading through more of the papers last night, I came across his wireless examination records, where he is labelled as a 'Radio Operator'!!! Other documents state, as you say, 'Telegraphist'.