BRIGG FOLK ASKED TO HELP RESEARCH INTO WALLY'S WAR

Can Brigg Blog followers give some help to a son trying find out more about his father's service during the Second World War, which included time as a Pow?
David Layne is the son of  Walter Henry Layne, from Brigg.  
Wally attended Brigg Grammar School in the early 1930s.  He served in the R.A.F. and was a prisoner of war, 1943-45.  One of his cell-mates was R. Coulbeck, whose wartime address was 97 Ravendale Street, Scunthorpe.   
He was a Private in the R.A.O.C. and being a PoW was announced in Times October 18, 1941.  POW # 6084 - Service # 7615370.
David would like to know how R. Coulbeck became a PoW. Can you help?
There's a good deal of information already online about "Wally's War." Here's a link