Read full text: David Cameron's EU renegotiation letter to Donald Tusk

David Cameron has today sent a letter to European Council President Donald Tusk, spelling out his demands for a new deal on Britain's EU membership and marking the start of his formal renegotiation.

Click here to read the letter in full

In it, the Prime Minister spells out some of his negotiating positions—and updates Tusk on his progress so far. His objectives are listed under the four key headings Cameron focused on in a speech this morning: "Economic Governance," "Competitiveness," "Sovereignty" and "Immigration," including the crucial demand that EU migrants to Britain must live here and contribute for four years before claiming benefits.

In the letter and in his speech this morning, Cameron said that his primary aim was to deliver "flexibility" in Britain's EU membership. He wants, he says, a new deal which will allow Britain and other non-Euro countries space to carve their own path while still benefitting from, and contributing to, the Union.

This morning's speech included a warning to Cameron's partners on the continent: "I don't want this reasonable approach to be misunderstood," he said. "Reasonable does not mean lacking in resolve."