I use SH3 Gen and NYGM 2.2. SH3 Gen gives some missions which are a little more interesting than patrol grid XX... Although they don't bring any reward, I usually give them a try.
This time on my first patrol Sept 39 with a VIIB out of Wilhelmshaven, I am kindly asked by BdU to sink the Transsylvania Auxiliary Cruiser anchored in Bristol !!

So early in the war I think I can venture in the Irish sea if remaining careful.
Question is : anybody been visiting Bristol already, tips on depth, minefields, subnets ?
I haven't decided yet if I give it a try, although Sept 39 is probably the only time to try something like this.