On 14 Dec, 00:36, wrote:
In article
,

(MIG) wrote:
Stratford may be an exception for some other reason, but an OEP can
surely only be required for a route on which PAYG is valid?

OEPs don't exist until 2 January. After then NR appears to divided into
two classes, where PAYG is valid today and where PAYG is extended from 2
January. Only the latter will need OEPs.

--
Colin Rosenstiel

The rule is simpler than that

NR train beyond zones of Travelcard - OEP required.