Photo certainly before September 1963, as at that time the service was dieselized. Beyond that it could be any time after May 1959, when the Brittania class engines were allocated to the service. I thought the lady pushing the pram ws my wife at first, but the photo is at least three years too early. I can't resolve the engine number, probably due to the restriction in KB for the photo but it might be 70037, which was one of the engines used, and it might be my father driving it. (See my avatar) The picture was certainly taken at around 6.30p.m, .which limits the time of year to mid April to early September.Probably April 1963 as the grass hasn't grown much after the exceptionally harsh winter.