British Prime Minister David Cameron says the European Union will have to become more flexible if it wants his country to stay in the 28-nation bloc.

Cameron has told an employers' organization he wants a looser, "more competitive" EU that gives greater protection to countries, including Britain, that don't use the euro currency.

Britain is holding a referendum by the end of 2017 on whether to remain in the bloc.

Cameron will publish his list of negotiating demands Tuesday in a letter to European Council President Donald Tusk. On Monday, he said he is seeking "a live-and-let-live Europe, a flexible Europe" that lets Britain remain outside of closer political and economic ties binding the eurozone countries.

Cameron said "we want to be in a common market, not a common country."