EU has struggled bc large nos. of refugees arriving IT, GR. Onward mvmt only by permission of UKgov (i.e. minimal).
Brexit will be hugely disruptive to these benefits. Indeed, the deal negotiated by the Con UKgov has no other purpose than to put an end to this happy state of affairs.
But wait, the gov't will reform both EU and non-EU immigration and level the playing field. Surely that helps?
/Ends