The UK ad market is "booming" thanks to the rapid growth in Internet advertising, according to ZenithOptimedia's latest forecast. The UK was cited as the standout ad market in Europe. ZenithOptimedia said the UK was "currently booming thanks to the rapid adoption of Internet advertising" and predicted UK ad spend will grow by 9.2% this year, compared to 4.1% in the Western and Central Europe region. Internet advertising will overtake spend on TV globally by next year -- a year earlier than previously predicted.