All I would say, if there is still the question of why the wings are on the wrong side of his uniform, is that it may be that because he was getting married he may have got good quality material for the uniform and asked a tailor to make up the uniform "made to measure" The civilian tailor may have sewn the wings on the wrong side in error. My dad asked a tailor to make a special uniform up for him when he got married on 23rd June 1940. His army issue kit was in a sorry state having been evacuated from France just the previous week.