Martin Sorrell steps down as head of WPP advertising agency

Boss of world’s largest marketing group steps aside amid investigation into personal misconductSir Martin Sorrell has fallen on his sword resigning from WPP, the world’s largest ad group he has run since founding it over three decades ago, ahead of the findings of an investigation into alleged personal misconduct.The 73-year old, who acquired a small Kent-based maker of wire baskets in 1985 and built it into the world’s largest marketing services group, told staff that for him