But the PA▸ , according to the OP▸ , says that from 23rd May, Penalty Fares will apply across the whole network.
The whole network includes the Cornish branches, the Severn Beach line, Castle Cary to Dorchester West, stations such as Dilton Marsh, Avoncliff, Castle Bar Park, Shiplake, Weston Milton, Culham, Finstock...
A simple final few words on the recorded announcement are all that is needed, "...except if you start your journey at a station with neither ticket purchasing facilities nor a Permit To Travel machine"
Passengers have to be accurate in their ticket purchase and use, on pain of criminal sanction. The least train operators can to is be clear and accurate in their pronouncements regarding passenger's obligations.
But the rules for charging
PFs▸ in PF areas always did have a lot of conditions - about notices, ways to pay at stations, staff training, etc. So the exclusion of stations not listed as PF stations isn't new. If the PF area is extended, that doesn't mean all the newly included stations will be PF stations.
I had assumed it was a requirement for PF area that only a few stations were excluded. The current rules under which PF schemes operate (as opposed to the rules for passengers) were explained by the
SRA» here (I don't know if here's a current equivalent of this). The relevant bit is part of section 4 "How we will decide whether to approve a penalty fares scheme" (my emphaisis):
Penalty fares stations
4.4
Passengers on a penalty fares train may only be charged a penalty fare if they got on that train
at a station which has been named as a ^penalty fares station^ by the relevant penalty fares
scheme. At these stations, penalty fares warning notices must be displayed and sufficient
ticket facilities provided.
4.5
Operators must normally name each of the stations served by penalty fares trains as a penalty
fares station. For example, if all trains within an area bounded by stations x, y and z have been
named as penalty fares trains, all stations within that area, including x, y and z, should
normally be named as penalty fares stations. However, an operator may not want to include
certain stations for a number of reasons. For example, if the station:
^ has no ticket facilities as it is unstaffed, and not enough passengers use the station to justify
a ticket or ^permit to travel^ machine (PERTIS▸ );
^ has no ticket facilities as it is unstaffed, and the amount of vandalism means that it is not
practical to maintain an operational ticket or ^permit to travel^ machine; or
^ serves a port or airport and is used by a large number of foreign visitors and people who do
not often travel by train, making it undesirable to charge penalty fares to passengers from
this station.
Operators must make sure that if these stations are not made penalty fares stations, this does
not cause confusion or make the scheme difficult to explain to passengers.
At the start of section 4, it says: "A penalty fares scheme is most suited to urban or suburban train
services where most stations have ticket facilities, and where busy trains and short intervals
between stations make it impossible to check every passenger^s ticket between every stop." So do
FGW▸ now consider their whole network is like that?