This question was answered on 8th June 2015
The Prime Minister, my right hon. Friend the Member for Witney (Mr Cameron), will lead on the renegotiations, working closely with the Chancellor of the Exchequer, my right hon. Friend the Member for Tatton (Mr Osborne), and the Secretary of State for Foreign and Commonwealth Affairs, my right hon. Friend the Member for Runnymede and Weybridge (Mr Hammond), and supported by myself and Cabinet colleagues. The Foreign Secretary and I are also responsible for the Referendum Bill. The Prime Minister has already started working with other leaders on how best to address the UK’s concerns and will hold further talks ahead of the June European Council.