Hey, many Of the British S and the larger T class Subs served in the Far East, a few of them started the war patroling in the north Sea (Norwiegen campaign)
Then made there way to the Med, where they had the most success and Impact on the Axis occupation in North Africa -
and if they survived that - some later ended up traveling to south east Asia (Via the Allied controlled Suez cannel)
They were based out of Trincomalee (Ceylon)then later opperated out of Fremantle (Australia).
I'd love a British Sub campaign to come to SH more than anything, first you get to battle it with the Germans, then the Italians, and lastly the Japanese...
It would make damn nice change from the usual Type 7 / Gato Line up - simming in those sub types is really getting pretty old in my opinion.