UK advertising spend grew 5.8% in the first half of 2015 to reach a record high of GBP9.4bn, according to the Advertising Association/Warc Expenditure Report data published today. Growth in digital advertising was a big driver, with a 13.3% increase in Internet spend to GBP3.9bn, with mobile accounting for 79% of this growth. Mobile ad spend grew 52% to break the billion pound barrier in a half-year period for the first time (GBP1.07bn).