They're missing an arrow
They've forgotten to include the number of people that would like to live in a different country altogether.
Also, if those numbers on the map represent splits in the native population of an area, I'd like to prod at your statement about Leeds, Manchester and Birmingham losing 80% of their population, yadda yadda. It may not be Venice, but Leeds is *NOT* in the fucking Midlands!
*I think that's right, as opposed to percentage change in population if everyone got their own way, etc. Someone at Orange doesn't know how to make a fucking chart, and you lot aren't helping. :-p