Britain’s National Health Service (NHS) has a pressing need for more doctors. Hospitals have found willing and qualified recruits overseas. Theresa May’s government refuses to issue them visas. Better patients be put at risk than immigration rules relaxed. Support for the NHS may be the closest thing Britain has to a state religion, but Brexit is nothing if not "taking back control" of the nation’s borders. This small lunacy illuminates a bigger choice. There is more to Brexit than supply chains, regulations and farm subsidies. It is about the nation’s character. Membership of the EU has anchored a cosmopolitan Britain in the wider world. Does leaving portend Britain First — a place that has had its fill of footloose elites, global corporations and migrants? Or is it to be Britain Unbound — a country of swashbuckling free traders with their sights on the world? Brexiters have so far ducked the collision. May has come down firmly on the side of a Trumpian interpretation of the 2016 r...

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