World War II started for England in 1939, and there was no peace until 1945. Below is a pic of my Mom and Dad in 1943! They were married in 1941, and Dad received his call-up papers (draft papers), on his wedding day! He chose to join the Royal Navy.
I do not know the reason for the photograph, but would speculate that either it was something they just wanted to do while he was home on leave or, because my (late) older sister was born in 1943, it could have been taken at around her birth date, or her christening.
I find old photographs really interesting because you can look “into” the faces… but can only guess what is going on in their minds. In this specific example, my Dad has a hint of a smile while my Mom seems to have a rather smaller hint! Perhaps it was at the end of his leave? Perhaps he had just recently received new orders? We will never know… but isn’t it fascinating?