393 British Army personnel died on the 7th January 1943, the vast majority of these (302) at sea. I'm guessing, although I don't know for sure, that the majority of these 302 men therefore, were en route to a war zone and were on a ship or ships which were sunk as a result of enemy action. This is supposition on my part but I'd like to know for sure.
1587677 Gunner Reuben Baum of 252 Battery, 80th Heavy Anti-Aircraft Regiment, Royal Artillery, was lost at sea on this date. He was 28 years old and has no known grave. A west Londoner, Reuben is commemorated on the Medjez-El-Bab Memorial in Tunisia.
At the going down of the sun, and in the morning, WE WILL REMEMBER THEM.
Ancestry.co.uk (1939-1945 Roll of Honour)
Commonwealth War Graves Commission