Airframes,
There's a good chance the footage you have was taken as part of a film called The RAAF In Europe which was filmed at Waddington in March 1944. It's available at the Australian War Memorial (Film Film F01372).
Among other things they shot a mock briefing, a still of which (featuring...
I run the blog which Bill linked to here (somethingverybig.com) - it's about my research about the story of my great uncle - W/O RW Purcell, who was the navigator on LM475 PO-B. I've not yet found a photograph of the aircraft, though I am in contact with the families of each of the seven in the...