As explained in our inaugural election forecast, up until May next year the Polling Observatory team will be producing a long term forecast for the 2015 General Election, using methods we first applied ahead of the 2010 election (and which are also well-established in the United States). Our method involves trying to make the best use of past polling evidence as a guide to forecast the likeliest support levels for each party in next May’s election, based on current polling, and then using these support levels to estimate the parties’ chances of winning each seat in the Parliament. We will later add a seat-based element to this forecast.
This month’s Polling Observatory reported falls in support for both Labour and the Conservatives. Our forecast again finds the parties locked in a statistical dead heat, although Labour has edged up slightly, by 0.3 points, to 36.5%, and the Conservatives have slid back further, down 0.6 points to 34.9%. The continued stagnation in the polls is starting to harm the Conservatives in our forecast, with a slight widening of the gap between the parties.