And they're off … £6.8bn Christmas ad spree gets under way

Walkers calls on Mariah Carey and Argos pulls on heartstrings but ad binge masks overall fall in spendingA record £6.8bn festive advertising spree gets under way this weekend with Argos, Asda, Iceland and Walkers calling on the star power of Mariah Carey and the cast of Frozen to help shift everything from crisps to turkey crowns and musical instruments.Argos and Iceland’s ads are launching during ITV’s Coronation Street on Friday, while commercials from Asda and Walkers &ndash