I don't really get Standard Premium.
The last time I travelled with Avanti (in 1st) I was surprised just how empty SP was.
Being a weekend, the tiny 1st class section was packed, yet both coaches of SP were almost empty, bar a family of 4 with 1st tickets who were unable to fit into 1st. I later walked down to the shop and noticed standard was all reasonably filled too yet nobody was upgrading to SP. I doubt this new price increase will help the situation.
I feel like they'd get much more revenue and passengers if they went back to 4 coaches of 1st class, provide a reliable and good range of decent quality and good sized meals, and offer reasonably priced advance tickets! Reopen the various 1st class lounges that have now shut. Perhaps rename themselves Virgin!!
I certainly travel a lot less by rail since Avanti took over. The 1st advances between Glasgow and Preston are now so expensive they cost more than the off-peak 1st. Far better and cheaper to go with TPEx 1st class on this section of line.