On 27 Nov, 17:09, "Michael R N Dolbear" wrote:
DaveP wrote

2) If I move during the year and I want to extend or restrict the
zonal validity of my ticket, what are the costs involved?

(snip)

Thanks to all for your helpful responses. To clarify I was just
wondering about the implications of moving from zone 4 to 2 (or
possibly just outside 6! with work generally being in zone 1), while I
have some validity left on my ticket. Of course if there were only a
couple of months left, I might just keep the ticket and make sure I
pop home to my folks often enough to justify it..