David Cameron claims that his renegotiation will "restore a sense of fairness to our immigration system". ,The Commission risks undermining the idea that any member state can keep control of its borders in the EU - just when the Prime Minister desperately needs to build up that idea in voters' minds. While the Commission insists that the UK can choose not to participate in this new scheme, many Britons will be left reeling by the idea that any member state will have to take in more migrants if it doesn't want to.