Bletchleyite
Veteran Member
They seem to have changed things recently so that, except on the Underground, any off peak ticket that uses the "Network Rule" to cross London ahead of the time from which you can leave London forwards will be rejected at the barriers on the way to London, including at the terminus before crossing London. Most annoying, and guaranteed to cause problems if any member of the barrier staff is not aware of the "Network Rule".
It's not that sophisticated. Usually it's just that particular gatelines will be set to reject by specific time ranges and ticket types. Gatelines don't know the actual time restrictions of specific ticket restriction codes, so they will be set to the general case to/from that station.
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Does this include off peak tickets that have no time restrictions?
It will yes. It will be as simple as "ticket type SVR is not to be let through before 1030" or whatever.