In terms of an update on this one, our supplier has done the work needed, it's now waiting on me to do some implementation work (unfortunately I'm very busy at the moment!), then our frontends will have to do some work to support it tooAlso reminds me to ask again about getting standard premium integrated a bit better with everything else - I appreciate it's already on your radar but may as well put in another nudge. Since by happenstance I am booking it along with standard class tickets to/from Hexham that are coincidentally close to or bang on the minimum connection time it may be useful to have a through itinerary if my connection were a couple of minutes late. Plus the use case of wanting to search "first/standard premium" when you're in a position like I am pick between WCML/ECML.
Hmm, I can't remember exactly how this logic works, will have to have a look tomorrowJust booked a return trip which amongst other legs involved the 14:55 from Carlisle. The seat selector showing that car J was standard premium, but on selecting it none of the seats were actually selectable, it being first class for that journey in practice I think.