One of Labour's biggest donors, John Mills, has said Ed Miliband's pledge to hold an EU referendum if there is a transfer of powers from Westminster to Brussels is "a step in the right direction".
However, Mr Mills has been clear that he would like Labour to promise an in/out referendum.
He said this morning: "I think we should recognise that the growth of the EU's influence over Britain in the past 40 years warrants a referendum regardless of future events."
Ed Miliband effectively ruled out a referendum on Britain's membership of the EU today, as he set out his party's stance on the issue.
Confused by Labour' pledge to have a referendum on Britain's membership of the EU? You are not alone.