If I have an off-peak return from London-Inverness
You already have such a ticket? That's a very expensive ticket to have (£239) to use on the sleeper. Assuming this is the return portion I'd be interested to know what your outward journey is to require such an expensive ticket, as I am sure we can find a cheaper way (or is it too late?)
and a single from Edinburgh-Fort William valid on the following day's early morning service (ie the one conveying the sleeper coaches)
Single? You're not coming back? Or do you live in Inverness and are getting the bus back?
can I just call up Scotrail, pay the sleeper supplement and then use this ticket combination to travel on the London-Fort William Sleeper?
Or is it not as simple as that....
By 'sleeper supplement' I am assuming you mean a berth? Seated sleeper doesn't require a supplement.
I don't see why not,
but somepeople may argue it's not valid because:
- It could be claimed the train does not 'call' at Edinburgh (Yes, it does call to pick up only, see previous topics where we have debated split ticketing on pick up/set down only services)
- It could be claimed the EDB-FTW ticket isn't valid in a berth because you can't book a berth for that section.
(I don't agree with those claims)
Counter arguments to that would be:
- Actually a London to Inverness ticket is quite possibly valid to Westerton anyway (consult the Routeing Guide to check)
- In which case you'd only need a Westerton-Fort William ticket
- You have paid so much money that they would accept it (probably)
- Berth attendants are not exactly ticket experts and would accept it anyway (probably)