Isabel Hardman

It's been a while since David Cameron had to give such a difficult feedback statement to the House of Commons after a European summit. Even his last tricky address, on his failure to block Jean-Claude Juncker as president of the European Commission, could at least be spun as the Prime Minister valiantly standing up for the right principle. But at this afternoon's session in the Commons, the Prime Minister will face complaints from MPs not just about how impossible Europe is but about how some parts of the Westminster machine knew about the so-called unexpected bill but others did not. So the questions Cameron will face will be: can you avoid paying this bill? Who can we blame, not just for the original situation, but the fact that officials apparently failed to pass the information on?

Kelly Tolhurst has won the open primary to be Conservative candidate for Rochester and Strood, I understand. The result is not due to be announced until this evening, but I hear that Tolhurst won by fewer than 50 votes on a turnout of 4,000. The turnout is the key in this as it will give some indication as to the level of interest in the constituency in the Conservative candidate. It is worth bearing in mind that the turnout in Sarah Wollaston's open primary in Totnes was 16,497. That much lower turnout in a more high-profile contest following a defection will add to party worries following yet another poll showing Ukip ahead in the constituency. UPDATE, 20.10: Tolhurst has been confirmed as the candidate.

One of the bits of their Parliamentary party meeting this week that cheered Conservative MPs the most was a speech by Tracey Crouch on why the Tories could win the Rochester and Strood by-election. Many of her colleagues who like to spend their spare time staring at spreadsheets are sincerely worried that the party could lose the seat, leading to all hell breaking loose in the party. Crouch, who represents the neighbouring constituency and will act as the campaign aide to the candidate once she is selected (the shortlist in the postal primary is a choice between two women), told the room that the demographic of Rochester favours the Conservatives far more than that in Clacton: it has fewer pensioners, more professionals and the voters are on higher incomes.

Is Number 10 really preparing for a U-turn on the European Arrest Warrant? After Coffee House reported some odd manoeuvres by chief whip Michael Gove involving him suggesting to Tory MPs that it might be better for the government not to opt back into the EAW, the topic came up at this afternoon's lobby briefing. The Number 10 spokesperson told journalists that: 'The government has set out the areas where it is, in principle, seeking to opt back in. We want to secure European agreement on that and then we will take a final view on which ones we opt back into.' That sounds rather like there is room for a shift. But a Number 10 source is insisting to me that 'there is no change'.

Whatever David Cameron's promised 'big bang' announcement on immigration in the EU is, it has certainly excited Conservative backbenchers. A group of them confronted him this afternoon to ask whether Britain would be moving to a points-based system for EU migration along the lines of Australia (something Ukip advocates), and they say that he did not reject it. This has made them even more excited. The Prime Minister was speaking to the 'No Turning Back' group of Tory MPs, which some of those present at the meeting described as 'a little uncomfortable', mainly because these are the MPs who tend to cause him the most trouble. Others felt the meeting was relaxed, but left wondering whether Cameron really would deliver on these hints that he's been dropping over the last few months.

The Tories will announce a big new policy on freedom of movement in the European Union, David Cameron told his MPs tonight. At a meeting of the Parliamentary party, the Tory leader promised what one Eurosceptic attendee described as a 'big bang' announcement on freedom of movement. Apparently this pleased those there no end, even those usually critical of the Prime Minister. MPs were also told they are expected to visit Rochester to campaign at least three times, and the cabinet five times, which is clearly an intervention from Lynton Crosby as the whips had decided at the end of last week that they wouldn't bother. This was what one source close to the PM described as 'a call to arms for us all'.

The Tories may have watched Douglas Carswell's re-entry into the House of Commons in silence, but he seems to be getting a reasonably warm reception from his old colleagues behind the scenes. He has already exchanged jokes and arranged to dine and drink with a number of them. For a few weeks this will send the whips into a spin, as they try to work out whether it really is just lunch, or a brewing defection. But it wasn't just Carswell who was nattering with Conservatives this afternoon. Nigel Farage, who watched his first elected MP re-join the Commons from a gallery, has also been talking to some of them. Philip Davies was spotted shaking Farage's hand in the members' lobby, while others tried to press the Ukip leader on the possibility that the Right may one day unite.

Why are the Conservatives so serene after losing the Clacton by-election and seeing their vote collapse in Heywood and Middleton? It is not that the party has finally decided endless fighting is no longer a good idea, but that it is holding its breath for the Rochester and Strood by-election. If Mark Reckless, the second Ukip defector, wins this, then the meltdown in David Cameron's party will make the Labour response this week look positively icy. The Tories had quickly accepted Douglas Carswell would win in Clacton and so there was little excuse for even their more febrile factions to panic.