外界原本认为由于英国独立党的崛起以及卡梅伦承诺如果连任将在2017举行公投，英国会否留在欧盟将成为本次大选的核心议题。
It had been widely assumed that the UK’s continued membership in the European Union would be a leading campaign issue, given the rise of the UK Independence Party and Cameron’s pledge that, if re-elected, he would hold a referendum on the question by 2017.