No need to go to the British coast to find ships. You'll just find mines and subnets and general trouble there.
Use the map that came with the game. It shows where you are likely to find targets - be they convoy or single merchs.
The patrol grids are mostly random and aren't always in a spot that has traffic normally. Tell the truth I usually just sit in one spot for 24 hours and then go off to the convoy routes.
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