Factbox - What business thinks about Britain's referendum on EU membership

Prime Minister David Cameron has pledged to renegotiate Britain's ties with Europe and then give voters a referendum on European Union membership by the end of 2017. Following are the views of business leaders: AEROSPACE AND AIRLINES Ryanair Chief Executive Michael O'Leary: "We're very actively supporting the campaign to keep the UK in the European Union. There's absolutely no doubt that the UK economy is better off in Europe than outside of Europe." Rolls-Royce President of Aerospace Tony Wood: