Convenience retailer Spar is rolling out a mobile "shop and win" campaign to drive a "reappraisal" of the brand among younger shoppers. The retailer is partnering with brands including Coca-Cola, Mars, Heineken, Molson Coors and Muller for the campaign, which kicks off on 5 January. It is offering "thousands" of daily prizes including £500 cash rewards and money-off vouchers, available via mobile.