EU talks resume amid deadlock over David Cameron's renegotiation demands

EU leaders have returned to the negotiating table after 20 hours of behind-the-scenes talks as David Cameron and European Council president Donald Tusk struggled to keep Britain's renegotiation on track.

The 28 leaders had initially been due to gather early in the morning for an "English breakfast" meeting to approve a package of reforms to the UK's membership, but breakfast became brunch, lunch, high tea and then dinner as opponents of the deal dug in their heels.