1.8% is today's daily digit in Europe - the amount Tesco's UK sales rose over the crucial Christmas period. It was the strongest rate of growth for the world's third largest retailer in three years. And a clear sign its 1 billion pound investment plan is working. Group sales overall were higher by 3.8% with a 7% rise in Asia more than making up for a half a percent fall in central Europe. Online sales in the UK did particularly well - up 18%.