Brexit challenges Britain’s global image of openness and tolerance, but “Cool Britannia” has what it takes to avoid being suddenly rebranded as uncool just because it quits the EU, advertising professionals say. From music to film and fashion, Britain has for decades enhanced its image as a modern and dynamic culture. The ease of immigrating and working in Britain helped it build a reputation as a welcoming and hospitable society. But the vote to leave the European Union last June sent a troubling message of tighter border controls and an exit from the EU’s single market. “Brexit is a self-inflicted…

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