EVERY December, the country’s biggest supermarkets battle it out for the title of best festive advert. And in the melee of Paddington Bears and monsters under the bed is a grandmother from Whitefield. Laura Lomax, aged 74, is appearing before the nation in a Christmas cracker hat and holding aloft a large carving knife. The grandmother-of-five is just one of the many faces appearing in this year’s Tesco Christmas advert. She said: “It was exciting to do it all, it was smashing!