There are loads of information pointing out that, for GWR stations beyond Reading would be valid from London Waterloo via Reading.
If that's the case, is via Windsor & Eton Riverside and Windsor & Eton Central permitted for journey originated from London Waterloo for access to stations west of Slough?
If that's the case, is via Windsor & Eton Riverside and Windsor & Eton Central permitted for journey originated from London Waterloo for access to stations west of Slough?