On final day of my next trip, planning to get from Frankfurt via Brussels-Eurostar to St Pancras (dep 08.16 - arr 13.57). All fine and dandy. Then have to head north. It occurs to me The Caledonian Express leaves Euston at 23.45 and I can get home via Edinburgh under own steam. 

If I get the McSleeper at that time, does that count as same travel day or does the time difference given day starts in Frankfurt mess things up. And is it still good as an “inbound journey” for getting back home? It wouldn’t be past the validity of the pass and not its final travel day either.