Two Notes on the Psephology of the Euro-Elections

by John Curtice, Patrick English, Stephen Fisher and Eilidh Macfarlane.

Even though the votes have yet to be counted, the Conservatives and Labour already seem to be undertaking their own post-mortems of what promises to be poor results for both of them in the European Parliamentary elections. Within the Conservative party there is a lively debate taking place about whether or not in the wake of the anticipated success of the Brexit Party, Tories could and should embrace at least the possibility of leaving the EU without a deal. Meanwhile, Labour, anticipating perhaps that the party has lost votes to others whom have adopted a clearer position on Brexit, looks as though it is about to consider the possibility of coming out more firmly in favour of some kind of public ballot.

Doubtless, all sides in this debate will look to the pattern of the results on Sunday for evidence to support their view of what their party should do. There has already been some speculation that the pattern of reported turnout in this election (information about which has already been released by some councils) suggests that voters in more Remain-inclined areas were more likely to turn out to vote, indicating perhaps a new determination among anti-Brexit voters to express their views at the ballot box. Meanwhile, we can anticipate that the results themselves will be poured over for evidence that the Conservatives or Labour have lost ground more in Remain-voting areas than Leave-inclined ones or vice-versa. However, in both instances caution will be required in interpreting the evidence when the full panoply of results is unveiled on Sunday night.


First of all, we consider the evidence on turnout. Two patterns can be observed in the data available so far. (Our evidence comes from the figures for 143 councils where the data have been collected by Matt Singh and/or Patrick Heneghan.) The first is that turnout appears to be up by a couple of points or so on 2014, and thus may well be a little above the average for previous Euro-elections. The second is that turnout appears to have increased more in those areas where a majority of voters backed Remain in 2016 than it has in those places where Leave were most popular.

Two notes of caution about the data on turnout are in order. The first is that the figures on turnout released so far are based on the total votes cast, including votes that might eventually be deemed invalid; turnout is conventionally calculated in the UK on the basis of the total number of valid votes cast, that is, excluding those votes which are deemed to be invalid. These amounted to 0.5% of all votes cast in 2014, enough to reduce the turnout as conventionally calculated by 0.2%. So even if the figures released to date prove to be representative, any increase in turnout is likely to prove a little less than has been reported so far.

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Calculating the Local Elections Projected National Share (PNS) and Projected House of Commons in 2019

By John Curtice and Stephen Fisher.

A key summary statistic of the outcome of each year’s annual round of local elections is the so-called Projected National Share (PNS). This is an estimate of the share of the vote that the principal parties would have won in a GB-wide general election if voters across the country as a whole had behaved in the same way as those who actually voted in the local elections. It provides a single, seemingly straightforward measure of party performance that can tell us not only how well or badly a party has done as compared with four years ago (when, typically, most of the seats up for grabs were last contested), but also as compared with any previous local election for which a PNS is available – even though the places in which local elections are held varies considerably from one year to the next.

In this blog we provide some guidance as to how the PNS is being calculated this year by the BBC and how it will be used to project an outcome in terms of House of Commons seats.

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