I am also the grandson of Bill Christmas who was the proprietor of Christmas and Chorlton, along with Sid Chorlton.  In the photograph of the High Street, the man on the street side of the car is indeed Sid Chorlton.  The man on the pavement side of the car is my grandfather, Bill Christmas (not Dan Christmas - and not the figure peering from behind the garage door!)  The girl in the car is my mother, Marcia Christmas, the daughter of Bill Christmas.  And, as my cousin Gary has pointed out in the previous note, Mike Christmas, who eventually joined his father Bill working in the garage sometime in the late 1950's or early 1960's, still lives on the property, in the bungalow behind the remodelled garage.