On Thursday 3rd May 2018, local elections were held in a variety of local councils and authorities, including all 32 London boroughs.

Since the ballots have been counted, hyper-partisan accounts have criticised ‘media bias’ and sought to share the ‘real facts’.

These posts have been shared thousands of times, and feature some key claims, which are potentially misleading.

In short

‘Labour won more than half of the seats’: This statement omits Labour, notionally, held more than half of council seats up for election.

‘Best result in London since 1971’: This claim refers to London councillors. Outside the capital, there was a swing from Labour to the Conservatives.

‘Labour gained Plymouth’: Labour also lost control of the same number of councils as it gained, meaning a net change of zero councils.

‘Jeremy Corbyn for PM’ highlights the raw different in council seats between Labour and the Conservatives.
‘Labour Left’ speaks of the share of total councillors, and highlights the London performance.

Counting Councillors

Raw counts or shares of councillors and councils are not measures of success. Local elections in England goes through cycles, with different councils having seats up for election each year.

42% of seats up for election this year were in London boroughs.

The psephologist Professor Sir John Curtice said, in the Political Studies Association media briefing for these local elections, that “London does not constitute 42% of England”. The professor continued:

Professor Sir John Curtice gives part of the Political Studies Association media briefing.

According to the BBC’s notional estimates (seeking to account for boundary changes), Labour held over 51% of all councillor positions up for this election in this cycle.

The projected national share, calculated by Professor Curtice and his team, have Labour and the Conservatives both on 35% this year.

This measure seeks to estimate what vote share each party would have if the vote had taken place across the whole of Great Britain. It is similar to the National Equivalent Vote Share, made by Rallings & Thrasher.

London Calling

This statement is referring to the number of councillors, when the party elected 1,221 councillors (and received 53% of votes) across London boroughs in 1971.

Only four borough councils have changed control since 2014: Barnet (NOC to Conservative), Richmond upon Thames, Kingston upon Thames (both Conservative to Liberal Democrat), and Tower Hamlets (NOC to Labour).

Tower Hamlets was yet to declare when this map was produced, and has gone from NOC to Labour.

Focussing on London ignores there was a swing from Labour to the Conservatives outside of the capital.

Net Gain Zero

The net change of councils for Labour was zero.

Labour lost control of Redditch (to the Conservatives), City of Derby, and Nuneaton and Bedworth (both to No Overall Control).

It is vital to remember the parties’ positions prior to the vote when reading claims about the latest local election.

This blog looks at the use of statistics in Britain and beyond. It is written by RSS Statistical Ambassador and Chartered Statistician @anthonybmasters.

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