If you're sneaky enough you can round ireland to the west and enter the strait between england and ireland. Keep going until you get to one of the two points where the distance between them are less than 20km (I usually pick the second one going in because the water is deeper). There just lay in wait until your hydrophone operator reports contacts. Surface for recharging and air at night and keep to submerged travel and batteries by day.
This becomes EXTREMELY dangerous later in the war (mid 1943-) aircraft are brutal and destroyers have very sensitive sonar. If they find you they will most likely kill you so total non detection is vital. I wouldn't attempt this in any thing bigger than a type VII.
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