Thanks for the alternative view, NJ -- as I say I'm not quite sure if I've understood the position correctly.
"The root cause of their discomfort is the EU's continued drive towards a single federal state, encouraging the citizens of all member states to believe that the project was only going in one direction and was irreversible. Fortunately the UK decided it did not want to be part of such a project before (and only just before IMHO) it was too late."
I think that's a little too biased, though. The UK government, after all, was happy enough to allow this for its own part, until the referendum at least. Now it's in the difficult position of having to adopt two positions that are directly contradictory, ie trying to ensure that EU citizens don't lose any rights while also taking those rights away, as would be consistent with the result of last year.