just to confirm "A class" is a sub?
I'll go into Salford Library on Monday, can you remember which dock it was in Salford
update;
is this them?
H.M.S. Submarines "Opossum", "Porpoise", "Otus" & "Auriga" at Manchester Docks b10101/5/15/16-19 October, 1971
Greater Manchester County Record Office
I have emailed them for access
update 2;
who is Bill Cannell b10101/5/15/20-22 October, 1971, same date