Hi Andy

While these planes were operational until 1941 the roles they held were very limited- this makes it easier to identify the picture.
The only ones in service during the war were flying long range recon patrols
except the ones in Ethipia used against the Italians there. If this was one of those planes the slipper long range tanks shown under the wings would have been removed to increase the airspeed of the plane.
My guess (as it is) stands that this was one of the planes that made the record flight to Australia. If it is not then it was one of the recon planes used to patrol the med until they were retired.