Mizter T wrote:

When I referred to "SWT-only" tickets, I literally meant that -
tickets only valid on SWT trains and marked as such. These exist
elsewhere, for example there are "FCC-only" tickets from London to
Brighton. However, apart from occasional promotions, there aren't any
"SWT-only" tickets issued.

Not even the Advance fares that are available on SWT from the western
extremities of their network? Anyone know for sure how they are marked?

Paul S