Some 21.8 million Internet users in the U.K. watched 4.7 billion videos in April, up 47 percent from the same month a year ago, according to a study by comScore Video Metrix. More than half -- 2.4 billion -- were viewed on Google's YouTube. No other site came even close, with the various BBC websites ranking second with 79 million videos viewed, followed by ITV's with 34.7 million. The same report also indicated that U.K. Internet users watched 971 million display ads on multimedia websites during the month. In a statement, Mike Read, who heads comScore's European operations, said that the numbers indicate that "online video is a powerful and growing vehicle for online advertising placement" in the U.K.