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Rooftop bars are for life, not just for summer. The one on top of Tower Hill's DoubleTree Hilton Hotel has had a Nordic makeover for winter, gaining weatherproof cover, heaters, sheepskin throws and hot drinks to keep visitors cosy. A menu of vodka-based winter cocktails (complete with Viking names) has been added to the bar list especially for the occasion, and hearty, meat-heavy dishes will be served, too.