Looking at the full cast list there is an actor Richard Leven - Soldier (uncredited).
Richard (born Henry Richard Leven) was starting out after the war in theatre which never took off but his life was colourful and like many ex-servicemen there were difficult periods.
His role during the war was a bomber pilot and he was a Squadron Leader at the age of 21. He was highly decorated, DFC, DFM and Belgium Croix de Guerre Palme and he flew more daylight bombing missions than any other pilot - 127.
He died without family but at his funeral in 97 they had to start the service early; so many people wanted to speak about him and how he had helped them.