I think the Cornish Sleeper from London is excessive, not least because a 5.5hr daytime journey isn't a Sleeper route.
I also, however, happen to think that the existing Scottish sleeper operation is a bit rubbish. I'm glad it's going to start going via Birmingham International, that's inherently sensible. I actually thought that should have happened a long time ago (probably the same as Milton Keynes vice Watford).
In terms of what Sleeper services don't exist but maybe should?
Could you manage the demand sufficiently to have just Inverness and Aberdeen on one train; whilst running Fort Bill and Oban on a separate one? I always thought Oban was a missing opportunity, but wouldn't profess to know the demand.
In future, would you ever be able to legitimately look for something like a Cambridge start on the Cornish, solely to open up any pent-up demand in Anglia, and offer other connectivity? At least it would extend the journey out, and do something new. It could always pick people up at somewhere like Finsbury Park or Stratford on its way through, and then on the way out of town too.
And, given there's an all-day service from West Yorkshire, the North East and such to Plymouth on XC, could you run something from Newcastle / Edinburgh down the East Coast, up through Birmingham, and down to Cornwall? There's some serious potential catchment at York, Doncaster and the like. Might even be very popular.
