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You have to order the Irn-Bru. You can’t come all the way to Scotland and not try Irn-Bru”. A smile spread across my face as Eric Schnure, former speechwriter to Vice President Al Gore, decided to humour me. “It tastes like bubblegum”, said Eric, in the way of a very polite person, expert in transatlantic diplomacy, who’d rather have had sparkling water.