Right so meanwhile back on the thread, I think we can say...
Salisbury is not a pure
PF▸ station, so therefore the requirements from
DaFT» to have an arrangement to allow platform tickets or similar do not apply.
Although one could argue that as the same rules (4.

say that you can only create a
CTA▸ if all operators have penalty fares, and as we have established here that
FGW▸ don't, then it seems there is a further issue as you can legitimately board an FGW train at salisbury with no ticket (if you are happy to pay the full undiscounted fare) and so there isn't actually a CTA, just a barriered area.
I'll try to buy a platform ticket at Waterloo next time I'm there, which I'm pretty sure is 100% PF.
In fact I might just get one for Southwark underground, where presumably there are no "less than honest" people....
http://www.london-se1.co.uk/news/view/4395 as no less than Boris is happy with them being issued there.
But the platforms are 'private', technically, and this does appear to be a loophole that allows station operators to annoy people genuinely seeing off / meeting others. It will be interesting to see what
SWT▸ come back with to moonrakerz.