The UK already has a "Canada++" deal. They have carve outs on all sorts of EU regulations, they're not part of the Euro-zone, they have the natural barrier of the Channel (aside from inflatable rafts) against illegal immigration...

Plus the UK currently has a say in all other EU regulation.

Brexit was a stupid idea by rah-rah Tories that think the UK is still an Empire. Cameron was a mindless twat that thought he could kill off half his party with a dumb referendum.