BlondieBC
Banned
Why bother holding them? If Brtiain is relying oin the blockade to win the war for her, this bridgehead idn't really needed.
BTW, if France has been overrun then the u-boat war has just got orders of magnitude worse, since French Channel and Atlantic ports can now be used as bases.
If you don't hold Dover, you lose the Dover Barrage, which makes it a lot easier for the U-boats to get to the Irish Sea and English Channel. Also, it will not be long before torpedo boats and torpedo planes from Dover are hunting in the English Channel. If you lose Dover, you like have to start using ports only west of Normandy.