Have I understood this correctly? They want to charge standard ticket holders an upgrade if an IET is used, but they don't want to refund first class ticket holders if a 150, 158 or HST turns up?Apologies if the point has been made before, but one purpose of not showing First Class on a train like that is to prevent anyone claiming a part refund whej it is not provided (if a 150/158 shows up...)
BTW the national timetable does not use "Standard class only" (and hasn't for donkeys' years) - where relevant it states "First class seating available."