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LONDON, 26-8-2015 — /EuropaWire/ — WPP reports billings up 5.0% and revenue up 6.8% in its Interim Results 2015 Reported billings up 5.0% at £23.156 billion, up 5.0% in constant currency Reported revenue up 6.8% at £5.839 billion in sterling, … Read the full press release