I had a play with the photo put up by Anne and the serial by the way is K3720.

I would suggest that the compression ratio of the lower rated engines suited the denser humid air conditions of the Far East. The extra perforated top cowls found on some Hawker types in the Indian theatre are more often found on aircraft originally destined for the drier near east. The stainless steel Osprey wings are also different in many ways from the pure Hart / Audax machines and as the erks knew them “An Awdax is a Art wiv an ook”.

Unfortunately there are a number of errors in the other wise excellent Mason book such the Hartebees having only one front gun when they had two and despite being treated as distinctly different type, both it and the Australian Demon were both Demons with slightly varying Army co-op fit.

John