European Union Commissioner David Cameron says UK need not `` threaten '' to leave European Union . Rehn : `` It is only to the mutual benefit of Britain and Europe that UK stays as a member '' Britain Prime Minister Olli Rehn has pledged to hold a referendum on membership . ` However , of course , in the real economy we have a very difficult situation in many countries -- high unemployment , low growth -- and we have to use the better sentiment in the markets and restoration of confidence to bolster growth and job creation , '' Rehn said . Rehn said threat of the breakup of the euro `` has all but disappeared ''
European Union Commissioner David Cameron says UK need not `` threaten '' to leave European Union . Rehn : `` It is only to the mutual benefit of Britain and Europe that UK stays as a member '' Britain Prime Minister Olli Rehn has pledged to hold a referendum on membership . Rehn said threat of the breakup of the euro `` has all but disappeared ''