<sod >Mr Barnier stuck doggedly to the EU's negotiating line, that the "single market and its four freedoms are indivisible", highlighting the difficulty Theresa May will have in trying to win access to the trading bloc while imposing tighter immigration controls.< eod>< sod > Mr Barnier said the EU and UK have "a common interest" in not prolonging uncertainty around Brexit, but stuck doggedly to the EU's negotiating line, that the "single market and its four freedoms are indivisible", highlighting the difficulty Theresa May will have in trying to win access to the trading bloc while imposing tighter immigration controls.< eod>