The changeover ticket would be issued undiscounted, and the discounted
rate for the original ticket would be taken into account when working
out the difference. Upon renewal, of course, normal charter discount
rules apply.

Thanks for straightening this out, shame it's not to my advantage!

I don't really understand why a ticket for the same TOC where the zonal
(other TOC/TFL) validity changes doesn't attract the discount, especially
since it's supposedly compensating me for poor service that I've already had
to put up with (uncompensated at the time). I have no other way of claiming,
and if my circumstances change I won't get any compensation

The discount on WAGN was 14% last year and 7% this year, it's more than
generous that it is also off the zonal part of the ticket, but if I do as
planned and drop zones 3-6 off the ticket and don't get the discount, it'll
cost me £200.

Regards,
Dave