this is the issue of "Flight" magazine in which he and his crew were reported as missing
sgt | p/o | a/c | 1940 | 1922 | Flight Archive
and FWIW
this claims to have two records of him, or someone with the same name. One during the war, and what looks like a post-war re-enlistment
https://www.forces-war-records.co.uk...Surname=cotton
However thats a pay-site and I've no idea how good the data there is. Anyone else know?