First class on Avanti isn’t what it used to be until fairly recently.
I used it regularly Carlisle to London. More room, better seats and decent food and drinks served at your seat. Much nicer than cramped and crowded economy!
There used to be 2 -3 complete first class carriages, now Avanti are replacing the first class seats with premium economy (the same seats, just re-named)…in the same carriages and the fare is a lot lower than the first class one. The difference in fare would probably buy a gourmet meal and a bottle of good wine in a restaurant. Which is ridiculous!
So the last time I went, I travelled premium economy, same decent seats, same comfort, same carriage, and brought a packed lunch as no food supplied…use the buffet car if preferred.
The only first class seats took up half a carriage.
Whether this is the usual all the time now and all routes I know not.