David Davis calls for EU referendums
Senior Tory MP David Davis is calling for a double referendum - one to approve a list of powers for the UK to seek to seize back and then an in/out public poll once they had been negotiated.
Mr Davis, a former Europe minister and leadership rival to Mr Cameron, said the first vote should be held within a year, before the next elections to the European Parliament in 2014.
Having a renegotiation list backed by a public vote - he predicted it would get the support of 70% of electors on a massive turnout of 90% - would be a "huge negotiating lever" in Brussels, he said.
"We have got to, somehow, dramatically change our relationship with Europe. Not a little bit of a power here and a little bit of a power there. We have got to bring back lots of powers," he said.
More top news
Inflation and chaotic public services led us here
As demonstrations sweep across Brazil, protester Bruno Correia explains what has driven so many Brazilians onto the streets.
Did Sir Mervyn King get the best leaving present ever?
George Osborne is tonight announcing that the government will consider splitting up RBS, the solution that he has advocated for years.
How are covert sources recruited?
At the centre of every foiled terrorist plot is a 'Covert Human Intelligence Source', or agent but how are they recruited?