'Brand America' tarnished by S&P downgrade, says WPP chief Sir Martin Sorrell

Sir Martin Sorrell's position at advertising company WPP has been thrown into doubt after investors warned they will push for his departure unless he takes a pay cut.

Sir Martin Sorrell's position at advertising company WPP has been thrown into doubt after investors warned they will push for his departure unless he takes a pay cut.

Sir Martin Sorrell, chief executive of global advertising group WPP, said the amount of corporation tax companies pay is "a question of judgement". Sir Martin suggested that coffee chain Starbucks chose to pay a £20m royalty to the UK taxman because "doing good is good business".