At the weekend I posted my forecast for the English council elections to take place on May 4th, using a comparison with opinion polls both now and 2013, along with the forecast made by Harry Hayfield at Political Betting.
Again they use local by-election results a a basis for their forecast, and come up with similar results to Hayfield for the Lib-Dems (+9%) and UKIP (-12%). The biggest difference is with Labour, predicting no change, as against -4% for Hayfield. More relevant is the forecast for seats, where they predict Conservative +50, Labour -50, Lib Dem +100, UKIP -100
Despite these chaps having considerable experience of election data, having written a number of post-election reports for the Electoral Commission, I believe that their forecasts might be somewhat out. This I have split into share of the vote and seat predictions.
Rallings & Thrasher share of the vote prediction
I have summarized some data in figure 1.
Rallings & Thrasher base their forecast on the Notional National Change, so I have shown the difference between those figures and the General Election Opinion Polls. There are reasons why the local council elections are different from the opinion polls, aside from the fact that opinion polls may not fully reflect actual decisions.
In 2013 UKIP benefitted in the local elections as people used their vote as a protest against the Coalition Government and/or in support of an EU Referendum. That no longer exists as Brexit is underway; whilst UKIP is in disarray and has fund-raising issues. In this I would agree with Rallings and Thrasher in a huge drop in support for UKIP, swinging from outperforming the opinion polls, to underperforming.
With the Liberal Democrats, I would agree that they should not only outperform the opinion polls, but do so by a greater margin than in 2013, when being in Coalition Government damaged their brand as being the alternative to the Conservatives in the non-socialist areas. This year they may also benefit as being the Party of those most opposed to Brexit. But the actual share of the vote was 20%. For the notional share of the National Vote to rise nine points would indicate a larger rise to over 30% of the actual vote. It would effectively make the arch-Remainers effectively the biggest beneficiaries of the fall in support for UKIP. That is possible, but would imply very large underlying switches in effective party support. Also, this large net increase in Lib-Dem vote share would be despite no net movement in the general election opinion polls in the last five years. Even if local by-elections results indicate such a swing, when voting for full councils I do not believe that this will replicate this result.
The forecast for Labour to have no change from 2013 is perhaps the most out of line with reality. Just four years ago Labour seemed likely to be in a position to be win the 2015 election. Now they are 13 points lower in the opinion polls. Most of the councils concerned are in the Conservative heartlands, with Labour traditionally trailing in third place. They thus have less far to fall than nationally, but barring a miracle in the next four weeks, they will lose vote share.
By difference, this leaves the Conservatives making much larger gains that 5% of the Notional National Vote.
Rallings and Thrasher seat change predictions
This I think is the most timid part of the seat changes to repeat they are
Conservative +50, Labour -50, Lib Dem +100, UKIP -100
Prof John Curtice on the Sunday Politics thought, based upon a 12 point swing in the opinion polls, Labour could suffer a much bigger loss of seats than the 50 forecast by Rallings and Thrasher. (hattip Guido Fawkes)
But to get an idea of the likely level of seat changes, it is worth looking at the changes in the similar (but not quite identical in terms of seats and councils) council elections in 2009 and 2013. These, from Wikipedia (here and here) are shown in Figure 2.
Please note that the numbers do not quite stack up due to (a) one more council in 2013 (b) boundary changes (c) by-elections. But broad comparisons can still be made.
UKIP gained 139 seats in 2013. The swing from 2009 to 2013 was probably greater than the counter swing they will likely suffer next month, so the loss of 100 seats is a reasonable estimate. Similarly the Lib Dem estimate of 100 seats gain seems about right, despite the likely net change in fortunes maybe be less at a National level not likely nearly countering the loss in popularity between 2009 and 2013.
When it comes to Labour, they are nationally in a worse position than in 2009. So their loss of seats could be greater than then suffered in 2009. A reduction of 300 seats, or nearly 60% of the defended seats, seems a reasonable forecast, with a 200 seat loss or less being a relatively good night for Labour with their current unpopularity.
The Conservatives should easily be the biggest gainers. Most of the councils are in Conservative Heartlands. Others, like Lancashire and Derbyshire, are where they have managed majorities in the recent past. Yet in 2013 the Conservative share of the vote was below that achieved in the UK as a whole in the General Election just two years later. Two years after the General Election, the party is in a considerably stronger position, so should gain considerably. A gain of 300 seats is my forecast.
An aspect to consider in local elections is the impact of turnout. In their report on the 2013 English and Anglesey Council Elections, Rallings and Thrasher noted that turnout was 31%, compared with over 39% in 2009.
In the similar 2009 report they note that this turnout was higher than in the previous three years.
Could the relatively high turnout be due to the confidence of Conservative voters? In 2009 the Conservative vote was 44.5%, 10% higher than in 2013. Labour had a 12.7% share (over 8% lower) and Lib-Dems were at 24.9% (5% higher). Then the Conservatives were a year away from going back into Government. In 2013, they looked like reverting to opposition. In 2017, there is a new sense of optimism among Conservative supporters, not seen since the end of the Falklands War – or at least with their Brexit supporters. These are concentrated in the middle-aged and older people, among whom turnout is usually higher than in the population at large. On the other hand, the Labour-supporting Remainers might stay at home, being doubly-demoralised. The change in seats could be even bigger than in either 2009 or 2013.
These are of course my forecasts compared with those of others who have more experience in these matters. What is crucial is how analyzing the difference between forecasts and actual results can deepen our collective understanding of what is happening in an interesting period in British history.