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The first Boris vs Ken poll of the season carries an obvious health warning: there are other candidates to come, not to mention another one-and-half years of the current mayoral term. Yet Tories might still be pleased that their man is 9 points ahead of his predecessor and main rival at this stage. And that's even with Labour beating out the Tories, in the same poll, when it comes to London's general election voting intentions. Andrew Gilligan puts two and two together to create a striking parallel: Boris is more popular than the Tory party in London, whereas Ken is less popular than Labour. Stir in the fact that Livingstone is polling lower than he did in the 2008 election, and his enforced spell on the sidelines has clearly done little to bolster his reputation.

If I was a member of the Labour party I would be feeling pretty uneasy this afternoon as news of Ken Livingstone's victory in the mayoral candidates battle sinks in. There is a cold reality about cuddly uncle Ken which deserves serious examination: he is a ruthless political operative who will sell out everyone, including his own party, to win. But Ken is not just a divisive figure, he was also a sinister Mayor, presiding over an wildly dysfunctional London Development Agency, controlling policy for London through a cabal of advisers calling themselves 'Socialist Action' and getting chummy with divisive and radical islamists including Yusuf al-Qaradawi.

Few writers can make a silly season story read like official history, so it's worth drifting behind the Times’ paywall to read Rachel Sylvester on Boris and Dave's mutual emnity. It is no secret that BoJo and DC are united in rivalry, but Sylvester adds a second dimension with insider quotations - a mix of arch witticisms and savage partisanship. Here are several of many from today’s column: ‘Most people at Westminster assume that Boris — compared by one of his editors to Marilyn Monroe, “another egomaniacal blonde” — still harbours ambitions to lead his party.

The most bizarre story of the day is Michael Crick’s post saying that in Number 10 there’s discussion of Vince Cable running as a Coalition candidate for Mayor of London. Now, I’d be totally shocked if this was to happen and have made some calls it still strikes me as thoroughly unlikely. The three main reasons for this are that Boris Johnson wants to run for re-election, the coalition would be taking a massive risk to test its electoral popularity in this way (imagine if Labour won) and taking Cable out of the Cabinet would unbalance the coalition. On the London mayor front, we’ll know who the Labour candidate is on the 25th of September—the result will be announced at the same time as that of the Labour leadership election.

Ken Livingstone’s long reign as a Labour London Mayor was predicated on his supposed insurgency against New Labour’s orthodoxy. Well, he remains intent on dissociating himself from his party. For instance today, he has endorsed Eric Pickles’ abolition of the Audit Commission. ‘This is one Tory cut I support,’ he said. This contradicts John Denham’s position. Perhaps Livingstone recognises that Labour cannot give the public sector unqualified support; there are fat cats protecting vested interests in Whitehall, just as there are in the City.

James Macintyre is well connected among Mandelson’s associates and he discloses that Gordon Brown agreed to back Mandelson if he chose to board the Eurotrain once more. Macintyre describes the revelation as a ‘demonstration of the supportive dynamic between what were at one time bitter enemies’, that’s true, though Brown would scarcely brand his right hand man an overrated liability. What’s more intriguing is why Mandelson chose not to apply for the job of EU foreign minister, which he considered for a time. Baroness Ashton can only expect to exercise ‘quiet diplomacy’ at best, which is unlikely to appeal to a man of Mandelson’s tastes.

When Mandelson said in his Spectator interview that he plans another 15 to 20 years in politics, what could he have meant? Now that his European career is over, there is only one decent post coming up for a Labour figure in the first half of the next decade – and I float the latest theory in my News of the World column today: that Mandy might stand as Mayor of London in 2012. A bizarre notion, I grant you, but no less bizarre than his CV to date – and Ken Livingstone is certainly taking the prospect seriously. Whoever the Labour candidate, they have a pretty good chance given that, by 2012, Cameron should be knee-deep in cuts and being very unpopular if he’s doing his job properly. Saying ‘vote Tory’ in London in 2012 will be no sure way to be elected.