I had the same reaction as Danny that it was a Vengeance!
As seems de rigeur in wartime photos, there HAS to be someone standing exactly where the sole means of clearly identifying it is, and obscuring it.
You would have thought, with all the lumps of lead whizzing about that they'd steer clear of such things, but, no, someone has to "photobomb" in precisely the WRONG spot!
It's almost a Polish honour guard fro the aircraft, the way they are looking and the Auster overhead....
I don't think the French used a yellow outer, that seems RAF - but surely they couldn't have a lone VV, where would they get any spares to keep it operational?.
Looks too big and slightly different from a Mustang, does anyone recognise if the Polish standard and double headed eagle might identify the troops?
Intriguing photo!