Comment by ghaff

Yeah, if you get a sleeper and figure you're saving a night in London or Edinburgh and you don't need to deal with airports, something like the Caledonian Sleeper isn't a bad deal or really consume a lot of extra time. But if you're not in a hurry, it's still a good experience for a lot of people.

But then I've also done a trans-Atlantic crossing but I was semi-retired at the time. Which I would do again at some point but was certainly neither cost nor time efficient.