And coming back to it again. The war diary of 8 R.T.R. confirms a Douglas shot down by 3 Messerschmitts on 8 December, says however it took off from L.G.75. 6 wounded, including the colonel and adjutant of 8 R.T.R. It also states an air ambulance and a Bombay shot down.
The De Havilland Air Ambulance is confirmed here:
http://www.3squadron.org.au/subpages/st%20leon.htm
All the best
Andreas