Publicis' flagship media agency has published its latest global advertising expenditure forecast, suggesting that Europe is "acting as a brake on global ad growth" compared to the flourishing networks across the world.

Media investment giant GroupM has predicted that UK mobile advertising expenditure is set to rocket in 2014, encompassing one quarter of total ad-spend and one fifth of paid search.

A report from the Internet Advertising Bureau has revealed that UK digital ad spend has broken the £5bn barrier for the first time - a 12.5% surge of £607m from 2011's spend of £4.81bn.

Over £800 million was spent on affiliate marketing in the UK last year according to an inaugural report by the Internet Advertising Bureau.