Thats what was proposed and turned down already DUP and all that.Who would build all our crap drives and steal all our workmen's tools if we didn't let the Irish gypsies over for a jolly every summer?
But no - you'd need border control at Holyhead and Manchester airport for everyone without a UK or Irish passport. We have a common travel area with Ireland, so it would only mean putting EU26 nationals in with the RoW ones.