the film i'snt Un taxi pour Tobrouk???
Isn't that the one with Sylvia Simms and Alec Guinness where they drive across the desert in an old staff car to spend august bank holiday (or "des Aout vacances du banque" in French) at Butlins in Tobrouk?
is that one where they pick up a hitchhiker, Anthony Quale and he doesn't how to get a brew going 
Peter, I'm sure thats 'Ice Cold in Alex', Black and White if I recall corectly. Based on an ambulance journey.
The photo' shows a RHD motor, so could it be something about Gibralta?
As plate not military but RHD but with a 'continental' look about itIt also shows one femail passenger in the rear.........................