ICM’s latest poll from the Guardian is out, with topline figures of CON 43%(+2), LAB 26%(nc), LDEM 8%(nc), UKIP 11%(-3), GRN 6%(+2) – changes are from ICM’s last poll, conducted for the Sun on Sunday in mid-September.

The seventeen point Conservative lead is the largest that ICM have shown in any poll since October 2009 (the Guardian cites it as the largest since 2008, but I think that’s because they are looking at the ICM/Guardian series of polls – the 2009 poll was one for the News of the World).

The size of the lead is likely flattered by the timing – it was conducted over the weekend, so the Conservatives could have expected some sort of boost from Theresa May’s first conference as leader. It’s also worth noting that ICM do tend to produce some of the most pro-Conservative voting intention figures – they have adopted a substantial number of changes since the polling errors of 2015 (switching to online, weighting by political knowledge, reallocating don’t knows differently and modelling turnout based on age and social class) which tend to produce the most pro-Conservative figures. That’s not to say they are wrong – in 2015 all the pollsters understated the Tory lead, so it’s very likely that in correcting those errors, changes will me made that produce more Conservative figures. We won’t know for sure until 2020 whether pollsters have gone too far in those corrections or not far enough.

In this case, even before the turnout weighting ICM would have been showing a very robust 14 point Conservative lead (and the reallocation of don’t knows actually helped Labour). Whatever you did with this data would have produced a huge great Tory lead – it’s the combination of a new Prime Minister, a Conservative conference boost, and a distracted opposition. Full tabs are here.