On Nov 11, 2:06 pm, "Tim Roll-Pickering" T.C.Roll-
wrote:
asdf wrote:
It's always been like that. It's to prevent holders of (e.g.) Z2-6
Travelcards being charged a Z1 extension fare when they make those
journeys using the NLL.

Are there any cases where a travelcard holder can make a detour journey,
even an unusual one, staying entirely within validity but get charged an
extension because the system assumes a trip into zone 1?

Yes - the system assumes the most obvious route. Eg Wembley Park to
Hammersmith probably assumes via Zone 1 rather than via Rayners Lane.