Behind the scenes of how the exit poll works - and who’s up, who’s down in week four?

In a week that's had a row over the NHS, Labour being attacked over anti-Semitism and the release of a big poll, Daniel and Shehab ask Robert for his take on whether the Tories, Labour and the Lib Dems are up or down at the end of week three of the election campaign. Daniel and Shehab chat to Professor Colin Rallings - he's ITV's election expert and is part of the team that produces the exit poll you'll hear at 10pm on election night. The poll correctly predicted the Conservatives wouldn't get a majority in the 2017 election - and you may be surprised by just how much work goes on behind the scenes to come up with the prediction. It's a fascinating listen - and if you want to hear more, you can find the whole interview at youtube.com/itvnews. We’ll bring you a new episode of Calling Peston every weekday around 5pm throughout the election campaign - and we'll also be putting out a bonus episode this Sunday night with reaction to what happened in the ITV Election debate, with representatives from seven parties taking part. Don’t forget to subscribe - and if you like what you hear, do rate us and leave a review. Get in touch with the Calling Peston team - contact @DanielHewittITV, @ShehabKhan and @Peston. For the latest election news, go to itv.com/news and follow @ITVNewsPolitics on Twitter.