Voters are casting their ballots in elections to 136 English local authorities, the Scottish Parliament and the Welsh Senedd. For most, it’s the first opportunity to cast a ballot since the 2024 general election. This set of elections is complex, taking place in multiple locations with ballots being counted over several days and across three electoral systems.

In England, local elections run on a four-year cycle, which means different sets of seats in various locations are contested in any given year. This is a bumper year, with around 5,000 councillors – predominantly in urban local authorities – being elected in nearly 3,000 wards. There are more than 25,000 candidates contesting them.

There is added complexity in terms of baseline comparisons, which determine what is considered a loss, gain or hold. While most seats will have been last contested in 2022, various changes mean around a fifth of wards don’t have a directly comparable year. Instead, they have been assigned an estimated notional seat winner.

Labour is defending more than half of the seats up for election and control 65 of the local authorities. This includes 21 of the 32 in London and more than two-thirds of the metropolitan boroughs. They are also fielding the most candidates, a title that went to Reform UK........

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