Mizter T wrote:

Indeed Southern already use a zonal system for setting the fares on
their routes, and they have done since January 2005. However they
continue to issue tickets with on a named point-to-point basis. (See
the FarePal page on the Southern website for more info on this [2].)

Merseytravel, which I regard as one of the more forward-thinking PTEs,
issues all rail-only seasons on a zonal basis. Indeed, these are new
tickets, which mark a bit of a departure from the old principle of that
PTE of almost everything being cross-modal (there is, for example, no
bus-only day ticket, though there is a bus-only season).

Neil