Suppose you are on a train from Glasgow to London Euston but due to the disruption between Preston and Wigan you are thinking of getting off at Carlisle to go through Newcastle. Are you likely to get a problem with the Advance ticket on the Virgin train to King's Cross? I see East Coast are accepting Trans Pennine Express tickets between Edinburgh and York but it doesn't mention West Coast, but maybe because they are both Virgin they don't need to mention it?