'Almost as botched as Monkey Christ!' Has the National Gallery ruined a Nativity masterpiece?

The restoration of this treasure took three years. So why do the shepherds look so gormless? Is the curly-haired one at a school disco - and is the other trying to remember where he parked the donkey? The National Gallery has ruined Christmas. Or, to be more precise, it has had a very good go at wrecking one of the world's greatest Nativity paintings. The fact that Piero della Francesca's Nativity is back on view for the festive season, after a three-year restoration the London gallery vaunts as...