On 15/07/2012 17:10, Ian F. wrote:
Thanks for the responses. Next time the situation arises I'll try buying
a ticket from the last Z6 station and see what happens!

In my very limited experience the ticket staff seem to accept this. But
it seems to me that if the train does not stop at the change-over
station this is technically invalid, whereas a Boundary Zone ticket
would be (as it's zonal). Now that we know that many train companies
are ruthless in prosecuting every single infraction of the rules, that
may be a significant risk.


--
Clive Page