303 Squadron: Convoy

From BoardGameGeek:

This expansion will take you over the seas surrounding and protecting Britain, which together with the air and the homeland, was an important setting of the battle. Your task is to protect your convoys against bombing from Bf.110s and the assault of the deadly U-boat. You will have limited time to reach the convoy and force the enemy to withdraw. In the expansion, you will find extra Bf.110s with the new "Bombing" ability; a deadly U-boat, threatening your convoys; and models of the transport ships you will need to protect. This gameplay expansion includes 7 miniatures, plus new cards, another scenario, and tokens and rules for expanded play. -description from kickstarter campaign