Why isn’t a zone 3-4 fare available for Thornton Heath – Wimbledon (by changing at Streatham), but a zone 3 only fare is available for Norbury – Wimbledon?
I think Norbury has been added afterwards without considering other stations on the line. There also isn’t a zone 3 only fare from Streatham Common, or a zone 3-4 fare from Selhurst. Probably need to ask GTR why.