John Lewis' new Christmas advert is hereFor many of us, a new John Lewis advert is as big a part of our annual festive traditions as grimacing through a gingerbread latte, snuggling up to a one-star Netflix original and making small-talk with the colleagues you’ve avoided all year at the office Christmas party.By now, the department store has got a tried and tested formula when it comes to its yearly Christmas ad – usually encompassing a cute kid or two, a friendly (and, indeed, marketable) mascot and a stripped-back cover of a popular song by an act you’ll have forgotten the name of six weeks later.