The head of the International Monetary Fund has said the Greek government's planned referendum on the terms of any new bailout plan will be invalid after Tuesday, when the current programme expires.

Christine Lagarde told the BBC that people would be voting on proposals that were no longer in place.

But she said that if there was a resounding vote in favour of staying in the euro and restoring the economy then Greece's creditors would be willing to try.

Speaking to the BBC's Gavin Lee, she said there was still time for the Greek government to change its mind and accept the eurozone proposals.