I was thinking of a Hawker Hart, but now I think about it, I think you're right Ken.

You'd be technically correct, anyway,
cspyro, since the Audax, Demon, Hardy, Hartbees, Hind and Osprey were all developments of the Hart.
The Demon was specifically made as the fighter version but these pictures don't give a proper view of the observer/instructor pit which, on the Demon, was angled downard toward the front.
The Hind was a light bomber and 'should' have some indication of bomb racks as well as a more distinct downward-curved observer pit, as did the Hart Trainer.
The Audax saw more action in WW2 (especially against the Italian Fascists forces) and usually had more of a horizontal opening around the observer pit (as did the original Hart bomber) which had a 7.7mm machine mounted behind it when used in the bomber role (elsewise, often removed).
The Osprey was built for the RN and had folding wings (which quickly rules that out for this one). My guess would be a version of the Audax but I could most definitely be wrong.

[edit] OK. By the time I got to posting, the experts had entered (thanks, Doug). Haven't got my own picture of a Nimrod (plane, anyway) and haven't seen it before.
