US company Omnicom and French firm Publicis say they are combining in a "merger of equals" that will create the world's largest advertising firm with a value of more than $30 billion (£20bn).
The combined company will be called Publicis Omnicom Group and be jointly led by Omnicom CEO John Wren and Publicis CEO Maurice Levy as co-chief executives.
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A chilly day with brighter skies to the top and tail end of the country and crisp sunshine