Greg,Air-Britain serial book confirms Dakota IV KP235 of 78 Sqn as stalled on take-off in mist and crashed, Istres, 5.9.45.
The printed CWGC register for Mazargues Cemetery Extension, Marseilles (pub in 1962) lists the following this Sqn/date (leave you to go to the CWGC website if the full entries are required):
ARCHER, Cpl Hedley Brightmore (Plot 11. Row A. Grave 6)
BELL, LAC Robert (Plot 11. Row A. Grave 12)
BRIDDOCK, LAC David (Plot 11. Row A. Grave 11)
CHAMBERLAIN, LAC Walter James (Plot 11. Row A. Grave 15)
COLDWELL, Cpl George Eric (Plot 11. Row A. Grave 16)
DEAN, Flt Sgt (WOpAG) Eric Frank (Plot 11. Row A. Grave 9)
DICKINSON, Fg Off (Pilot) John Edward (Plot 11. Row A. Grave 7)
ELLIOTT, LAC Ronald Fulstone (Plot 11. Row A. Grave 2)
HADDOCK, LAC Victor Robert (Plot 11. Row A. Grave 13)
HAMSHERE, LAC Alfred Edgar (Plot 11. Row A. Grave 3)
HUTCHINSON, Cpl Joseph (Plot 11. Row A. Grave 8) (note death date given as 6th)
JONES, LAC George Brice (Plot 11. Row A. Grave 17)
MORGAN, LAC John Ivor (Plot 11. Row A. Grave 14)
RICHARDS, LAC Ronald (Plot 11. Row A. Grave 10)
SUTTON, LAC Edmund Stuart (Plot 11. Row A. Grave 1)
VENABLES, Fg Off (Pilot) Arthur Ernest (brother of GWV) (Plot 11. Row A. Grave 4)
VENABLES, Fg Off (Nav) Guy Willberforce (brother of AEV) (Plot 11. Row A. Grave 5)
And a possible died of injuries later victim:
STEVENS, LAC Joseph Charles (dated 28 Sep 45, but no Sqn No. given) (Plot 11. Row A. Grave 1A)
A diagram mapping out the grave locations shows a small but distinct gap between graves 1-17 and 18-33 in plot 11, thus suggesting that all of the 78 Sqn victims are interred in 1-17 (note that Sutton is grave 1 and Stevens is grave 1A).
I entered grave info above as a cross check that I had picked up on all 17 (18 if Stevens included, as seems likely he should be) who died (assuming that no others died and were buried elsewhere).
Errol