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Perhaps I explained the Watford / Euston difference badly. The Central to Queen Street journey doesn't have to go all the way to London as you can change at Watford Junction instead (both southbound Lowland and northbound Highland Sleeper stop there). But the reverse journey wouldn't be possible...
Caledonian Sleeper serves both Glasgow Queen Street (Highland Sleeper) and Glasgow Central (Lowland Sleeper).
Shortest journey from Central to Queen Street is via Watford Junction and Dalmuir (you can't get off at Queen Street on the Highland Sleeper, you have to continue to Dalmuir, then wait...
Was that in the space now occupied by platforms 12 and 13 (created for the Airport Rail Link), or was that space used for something else like parcels or passenger drop off?
The "upgrade" option appears to be to buy a brand new Club Flexipass, then contact CS and they'll refund the outstanding tickets on the Classic Flexipass.
All three nations within Great Britain. Unless Avanti have managed to find a solution to the whole "trains getting wet when travelling from Glasgow to Belfast" issue.
According to their website all services from Tuesday June 15th to Saturday June 26th inclusive.
Although even that's not clear. Presumably it includes arrivals on the morning of Saturday 26th (as they don't run services on Saturday evenings). But if it includes arrivals that day, does it also...