From this threadThere is quite a big question as to how viable that operation would be without the Glasgow / Edinburgh stops if it happens.
(Sorry if there's been a thread on this already – I couldn't find one when searching for it.)
What do you think the chances of Grand Union's proposed Stirling – Euston (four trains per day via Larbert, Greenfaulds, Whifflet, Motherwell, Lockerbie, Carlisle, Preston, Crewe, Nuneaton and Milton Keynes Central) services are?
It might get some traffic from the Scottish Central Belt as well as passengers from Stirling, Perth, Dundee and northern Scotland who'd prefer an easier change than Edinburgh or crossing Glasgow. I suspect that its main customer base would end up being those going from Nuneaton, Crewe and – especially, where LNR isn't an option – Preston and Carlisle to London, then north of Edinburgh – Preston, Crewe and connections from there.
I don't know if there's any other factors which led to Wrexham & Shropshire ending, but the fact that that called at Wolverhampton and Tame Bridge Parkway, which have better services to Birmingham than Larbert, Greenfaulds and Whifflet do to Glasgow / Edinburgh, doesn't make me massively optimistic about Grand Union. (Motherwell's only fifteen minutes from Glasgow but already has four trains per day to Crewe, eleven to Euston plus the Sleeper and five TPE services per day.)