In January I asked if anyone could identify this car, and also passed a request on to the Surrey Vintage Vehicle Society who are skilled in the identification of old cars. This proved a challenge but one of their number reported that it was a 1908 GC Light Car with Sultan 8HP engine made by Automobiles G. C. , H. Guyot et Cie, Paris, - and only in 1908.
There were two other cars on my Motor Car page and they kindly identified these as well. The car on a postcard in Colliers end was also a French car - a 1925 Citroen 5CV Model C - but made in Slough, while the bullnosed Morris was a 1925 Morris Cowley Two-Seater with Dickey. [SVVS Identification Page]
In each case the date of car manufacturer can be identified to the year - which shows how useful cars can be in identifying the earliest possible date for a photograph.