Hi Brian,
40941 Ian Geoffrey Gwynne POTTS RAF
http://www.london-gazette.co.uk/issues/34700/pages/6658
and...
POTTS: 40941 Ian CG[sic]: NZ: Plt Off: 'Hiram':22-5-40 from West Freugh. Missing 1-6-40, presumed killed but in fact PoW. CO 73 in Middle East, 6-5-48 to 12-1-49.
See:
The History of 73 squadron. Part I, 1917 to November 1940.
Minterne,Don.
Dorchester:Tutor Publications,1994.
p.251
Col.