Although not in this case, as I believe the rejected advance ticket was for another ScotRail service, how does a TOC receive compensation, where ticket acceptance has not been arranged, for carrying a passenger who has been delayed by another TOC?
Personally, I detest TOC only tickets for this very reason. They have the potential to cause major grief to the travelling public - often unnecessary grief. I recently had a lady present a LNER Only ticket on my local train to Perth (it was a 1st class from York to Inverness), when pointing out it was not valid she explained she had been delayed and missed her connection (the last, and in fact only, LNER connection of the day). I offered to excess her ticket to the any permitted (not technically allowed but it would allow her unhindered travel after Perth) for a few pounds (about £3 IIRC) but she refused complaining about the poor 1st Class offering on ScotRail. I left it at that. I had enough to deal with catching the pay when challenged (this was a stopping service) and toilet dwelling fraternity. We later had a bit of a chat and parted on very good terms. I hope that she left with a positive view of rail travel despite her delayed journey. But think on this: she travelled for over 150 miles on my company yet we received no revenue from the passenger. Another company received that revenue, let her down, yet keeps that revenue. Yet the difference between the flexible any permitted and the TOC only was only a few pounds less - no real saving at all - but fraught with risk.