Paying tax is a 'question of judgement', says WPP chief Sir Martin Sorrell WPP, which has 163,000 staff in 110 countries and is the largest marketing communications group in the world, moved tax domicile in 2008 in protest at the potential "double taxation" of corporate profits proposed by the then Labour government. When the Coalition dropped the plans, Sir Martin agreed to return to London. He also told the BBC in a wide-ranging interview that he expected WPP would see 2pc-3pc global growth in 2013, with "significant double-digit growth" coming from China. However, he said businesses still faced a difficult trading environment and cash-rich firms remained reluctant to invest due economic uncertainty in the eurozone, China and the US. On corporate pay, Sir Martin said consultation over his proposed £6.8m pay deal had been badly handled in 2012, but added: "If we want world leaders ... we have to be competitive."