While I’ve been uncharacteristically silent, the discussion in one of the comments threads below has wandered off from the West Lothian Question to the Schleswig-Holstein question.
All you need to know about that one, as far as I remember, is that Lord Palmerston is supposed to have said that only three people every understood the Schleswig-Holstein question. Prince Albert was dead. A German professor once did, but then went mad. And he himself did once upon a time, but had forgotten all about it.