Geneva/Luxembourg — In Prime Minister Boris Johnson’s post-Brexit vision of a dynamic economy unshackled from the EU, depressed British port cities will come roaring back to life as tax-exempt free ports. A concrete bunker on the edge of Luxembourg’s airport provides a useful reality check.

There, on a side road flanked by dirt banks and a highway, a black-and-white sign surrounded by weeds indicates you’ve arrived at “Le Freeport”. First impressions don’t smack of a hive of activity, or even intrigue.

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