If you don't mind a longer journey, you can go via Manchester and Crewe. Tack on an hour or so though!Any Splits ? Preston is the obvious
Best thing to do is put your specific journey details into a splitting site/app and see what it comes up with. There are a few to choose from.
Trainsplit finds a combination of five tickets for walk up travel, with the price reducing from around £138 to just over £90
I certainly know from previous experience that Advances between Glasgow and Crewe are regularly available at the lowest tier that's sold (V2X), even only a few weeks before travel, but obviously this is limited to those trains which are legitimately less busy.The advances between Glasgow to Birmingham seem quite expensive or sell out fast .