Greggs has released its long-awaited Christmas advert and announced the return of its Festive Bake, with the help of the queen of Christmas herself, Nigella Lawson – and she’s coined another iconic phraseGreggs has released its long-awaited Christmas advert and announced the return of its Festive Bake, with the help of the queen of Christmas herself, Nigella Lawson – and she’s coined another iconic phrase