Thanks for the reply guys, I ask as I had a passenger with the aforementioned Slough-London terminals season claiming it was valid to Waterloo, trying to exit the station at Clapham Junction. I was not 100% sure so I checked with ticket office staff who said no, thus I refered the passenger to an RPI!
What made me laugh was that this passenger claims their ticket was accepted by the train guard to Windsor Central and also that route:Any Permitted apparently meant any route they liked could be taken!
If the said Season ticket had been a Windsor Central - London terminals then I may not have questioned its validity, however from the debate above it seems that a specific routing is needed on the season to enable travel via the other Windsor station!
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Customers travelling from Windsor & Eton Central to or via Datchet may not travel via Windsor & Eton Riverside. This easement applies in both directions.
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I do not understand this easement, surely someone would be able to walk from Windsor Central to Windsor & ER if they were travelling to/via Datchet?! Otherwise a Windsor & Eton Central to Datchet ticket may be routed via London (Windsor to Paddington via Slough, then underground to Waterloo, then train to Datchet) which would seem absolutely bizarre! Or maybe I'm just being thick