UK viewers favour interactive pre-roll video ads “twice as much” as their global counterparts, according to a study from Exponential Interactive. The report analysed more than 9,500 campaigns that ran across Exponential’s video ad specialist AdoTube totaling 13.5 billion impressions. It revealed that interactive ads that run ahead of video content accounted for twice the share (72%) of in-stream video ads in the UK in 2012 than they did globally which saw a 36% share.