Hello,
Brian Cull, in his, Diver! Diver! Diver! (Grub St/London/2008/pp.317 & 442), states that Austin was flying 402 (RCAF) Sqn Spitfire XIV RM686:AE-? when he scored his V-1 kill on 23 August, 1944.
The 402 (RCAF) Sqn ORB agrees:
AIR 27/1778/14 - 402 (RCAF) Sqn ORB (F.541) Aug 1,44' - Aug 31,44'. Image 10 of 13.
http://discovery.nationalarchives.go...ils/r/D8438552
Col.