23 Feb 2016 --- The bosses of Diageo, Asda and Greene King are amongst bosses of over a third of Britain’s largest companies who are calling for Britain to stay in the EU. The backing of drinks giant Diageo chief executive Ivan Menezes, Greene King boss Rooney Anand and Asda chief executive Andy Clarke, will be a boon to David Cameron as he looks to lead the fight to keep Britain in the EU.