THE CHALLENGEWe wanted to remind those browsing and planning their Christmas meals how delicious M&S Christmas food is and that every dish has an extra-special M&S twist.THE IDEAThe world's first lickable mobile banner. Lick the cream off the Christmas pudding to find the hidden silver sixpence (a yummy e-voucher).THE IMPACT45,000 hungry people engaged with our tasty ad.