No to all.
The photo was taken on my return journey which was entirely made by bus (apart from the first five miles or so to Staines). The route chosen to get home was as follows:
Feltham - Staines - Camberley - Aldershot - Fleet - Reading - Oxford - Swindon - Chippenham - Bath
Thus this picture must have been taken at a station in the vicinity of the route from Feltham to Reading, but not necessarily on the Waterloo to Reading route. The following is a list of SWT stations within roughly two miles of any point on the journey I took:
Whitton, Hounslow, Feltham, Ashford, Staines, Wraysbury, Sunbury, Egham, Virginia Water, Longcross, Sunningdale, Ascot, Bagshot, Camberley, Frimley, Ash Vale, Aldershot, Ash, Farnborough (Main), Fleet, Winchfield, Earley
It's one of the above.