Speaking this morning during his radio phone-in show on LBC, the Deputy Prime Minister Nick Clegg said years of guesswork and uncertainty over Europe needed to come to an end.
What we need to do is yes, work together across party lines in Britain and in other countries to constantly reform and improve Europe. I want to see it become less bureaucratic.
But, I don't think you serve the British national interest - and I certainly don't think you protect the three million jobs dependent on our place in Europe, if you somehow suggest you're heading to the exit door.
Years and years and years of guesswork and uncertainty are not good for the kind of stability you desperately need to foster a recovery after this terrible economic shock we suffered some years ago.
Centrica's boss warns an EU referendum risks "total destabilisation" for businesses; the Next chief suggests that view is "scaremongering."
There will be sympathy, yes. But will they agree with him? No.
Conservative MPs said their "achievable" proposals to change Britain's role in Europe do not represent an ultimatum to the Prime Minister.