British expats could lose the right to live and work in Spain in the event of a Brexit vote, the country’s Prime Minister has suggested.
The *right* to live and work there is derived from the Single Market rules. Exit that and lose the right.
There are other methods of allocating that right of course: Schengen does it (Switzerland is not an EU member but is in Schengen) and again there are other ways of doing the same thing. And Brits did live in Spain centuries before the EU was even dreamed of: so again other methods of achieving the same aim are obviously possible.