asdf wrote:

Unless I've entirely misunderstood, you don't need an OEP if you are
intending to travel using a PAYG Oyster.

It is only needed if you have a season/travelcard on your Oyster and you
want to use PAYG in order to pay for an out-of-zone journey.

Yes but if you have the season/travelcard already on it's difficult to use
PAYG. For instance if I have a Zones 1-3 travelcard and want to go Forest
Gate (Z3) to Ilford (Z4) I *can't* just use PAYG - I will *have* to get an
OEP which won't be available at my local starting station.

Why won't you be able to get one at Forest Gate? Won't there be Oyster
ticket machines at all PAYG stations?

The implication is that OEPs will not be available at National Rail stations
that are currently *not* PAYG stations.