Sir Martin Sorrell
Media playback is unsupported on your device
Video

WPP reduces full-year outlook again

WPP, the world's largest advertising group, has reduced its full-year outlook for the second time in two months, sending its shares lower.

The group said it had not done as well as it had hoped from Euro 2012, the Olympics and Paralympics and the US presidential campaign.

Its chief executive, Sir Martin Sorrell, said the results reflected growing concerns about the world economy.