That happened well over a year ago. £10 Rugby down to London, from there up, I'm not sure when the £15 cost of upgrade stops, I suspect from Preston onwards its £25. Been that way for a while.

When they first charged me this (£15 vs £10 from Wolverhampton), they had started doing sandwich on the weekend, from just tea/coffee/snackbox. The conductor said they were going to do alcohol included in the upgrade at the weekends, but that was a long time ago and never appeared. Most of the time on a weekend you end up just going to the buffet and getting stuff from there, anyway, and nobody does the at seat service.