Dear Ed,
The EVANS, DFC I am looking for few some missions with Nš 467 Squadron on Lancasters as a Navigation Officer and was still a full Squadron Leader by mid 1943. At first I thought you had found the person I am looking for, but it seems no...Donald Randell Evans flew on Fighter Command (FIU) and was a Wing Commander by 1941:
http://www.rafweb.org/Biographies/Evans_DR.htm
However one can not discard
Adriano