The car , reg CMP 1 seems somehow familiar (an Allard?) but a quick trawl of Google failed to thrown up any references as far as I could see.
The giveaway feature is perhaps the AEC sign in the background - maybe the bus/truck factory?
Does anyone have any idea who this is, and more specifically, where it is? The only venue I can recall that had this kind of industrial background was one that ran round a Lancashire mill works in the 1950s...but I can't recall the name of it!