As you know, a number of ministers who want to leave the EU have told me they are frustrated by the Prime Minister's refusal to let them speak out.

So when I interviewed David Cameron just now, I asked him whether he would lift his ban on them speaking their minds - especially since they argue he has tilted the playing field against them by beginning his own campaign for the UK to remain in Europe.

His answer suggested that the likes of Iain Duncan Smith, Chris Grayling and Theresa Villiers may have a bit more freedom to say what they think.

Mr Cameron told me: "I'm not asking people to twist themselves in different directions and say things they don't believe."

Which suggests that if a "leave EU" minister is asked a direct question about the Prime Minister's new deal with the UK, they don't have to pretend that they back it.

And even though we all have a pretty good idea what their views may be, it will still be a big moment as and when any of them say the deal isn't enough to get them to vote to remain in the EU.

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