In Wales, Plaid Cymru held off Reform to become the largest party in the Senedd for the first time. The SNP lost votes in Scotland but remain the largest party. Both parties will need to work with others to hold a majority, however.
Sky News' National Equivalent Vote (NEV) is an estimate of each party's vote share in England council elections projected into a nationwide vote. Reform lead on 27% of the vote, with the Conservatives in second with 20%.
That is an improvement for the Tories compared with last year's local elections, while Reform have slid backwards slightly. Labour are in third, with just three points separating them from both the Greens and the Lib Dems.
Across English local elections, Reform have gained over 1,300 council seats and 13 councils, mostly at the expense of Labour who are down over 1,200 seats and have lost more than 30 councils.
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The Conservatives have also suffered heavy losses, and have lost nearly 500 seats and eight councils. The Lib Dems have gained almost 800 seats and 13 councils, while the Greens have gained more than 300 seats and four councils.
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Sky's election expert Professor Michael Thrasher has projected a redistribution of each party's seats in the House of Commons elected in July 2024, based on the NEV.
The result is a hung parliament with no single party able to pass the threshold of 326 seats required for an overall majority, but with Reform as the largest party.
Reform UK would win 284 seats, 42 seats short of a majority. Labour would win 110 seats compared to 96 seats for the Conservatives, despite winning a smaller vote share.
The Liberal Democrats would come fourth with 80 seats, followed by the SNP winning 36 seats. Plaid Cymru and the Greens are each projected to win 13 seats.
More than 40 councils have changed hands in what was a dramatic and historic election night.
The British election map has been re-drawn again, and the multi-party politics era will leave many councils attempting to operate with complex coalitions or minority administrations.
Scotland and Welsh devolved elections
Elections for devolved parliaments in Scotland and Wales delivered significant blows for Labour and the Conservatives, while nationalist parties and Reform performed well.
The Senedd elections in Wales were dominated by Plaid Cymru and Reform, both of whom have taken approximately a third of the vote each and seen significant gains.
These gains have largely been at the cost of Labour and the Conservatives, who have both seen lowest-ever vote shares in the Senedd - with Labour ending up at just 11.5%, down 24 points from the last elections in 2021, and the Conservatives at 11%.
Eluned Morgan, leader of the Welsh Labour Party, resigned on Friday after losing her own seat in the Senedd.
Turnout in Wales this year was the highest on record since Senedd elections began in 1999, at 51.6%, and the first time that more than half of the electorate turned up to vote.
By contrast, turnout in Scotland dropped significantly since 2021 - down 10% to 53% - but is more in line with pre-2016 levels.
Holyrood's electoral system gives people two votes: one for a specific candidate to be a constituency member of Scottish Parliament (MSP), and another regional vote, which goes towards a wider party or independent candidate.
The SNP remained the largest party with 58 seats, with one regional MSP and the rest constituency-based. But the party fell short of a majority, and its their constituency vote share was down 9.2% from the last elections in 2021.
As in England and Wales, Nigel Farage's Reform UK has seen the biggest jump in vote share, to 15.8%, making it the third largest party in vote share and tying with Labour for 17 seats. It failed to gain any constituency seats but won the highest number of regional seats.
Though Labour's performance (19.2%) may be poor for a party which once ruled Holyrood, its drop in vote share since 2021 is minimal (-2.4%) compared with the Conservatives (-10.1%).
Where are Labour doing worst?
The seats where Labour were strongest previously - what would have been considered their heartlands - are where Labour are losing worst.
A particular spotlight for Sir Keir Starmer is London, where votes are still being counted for some boroughs. Labour previously held control of 21 boroughs in the capital.
So far, Labour has lost control of nearly half the boroughs (nine) - two to the Greens, Westminster to the Conservatives, and six to no overall control.
Across London, Labour has lost over 350 council seats while the Greens gained over 200 so far.
Where are Reform doing best?
It's the opposite story for Reform. They are picking up most votes in areas with older voters and places where fewer people went to university, as well as areas where lots of voters backed Brexit.
Their coalition of support appears similar to those voters Boris Johnson was able to win from Labour in his 2019 general election victory.
Sir Keir Starmer won some of these areas back in 2024, but they appear to have rejected him now.
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How are the Conservatives getting on?
The government aren't the only losers. The official opposition have also lost over 500 seats and control of Essex and Newcastle-under-Lyme to Reform, but will still have been buoyed by reclaiming Westminster council from Labour.
Similarly to Labour, they are losing most votes in areas where they used to be strongest. They are also losing to Reform in older areas and places where lots of people voted for Brexit.
How about the Lib Dems?
Sir Ed Davey's party has taken control of Stockport and Portsmouth, and increased its majorities in the south London councils of Richmond-upon-Thames and Sutton.
Sutton, where a majority of voters backed Brexit in 2016, used to be a Lib Dem/Tory marginal. Now it's almost a one-party state. Richmond is now literally a one-party state - the Lib Dems now hold all 54 seats there.
What about the Greens?
The Greens have surged in popularity since Zack Polanski was elected their leader in September last year. They too were expected to make significant gains at these elections.
They have won control of four councils - Hastings, Hackney, Norwich, and Waltham Forest, the last two which they gained from Labour.
Some areas where the Greens were expected to do best are still due to count their votes.
The Greens have performed well in London council mayoral elections, taking both Hackney and Lewisham from Labour.
There were holds for Labour in Newham, for the Conservatives in Croydon, for the Lib Dems in Watford, and for Lutfur Rahman's Aspire party in Tower Hamlets.
The Data and Forensics team is a multi-skilled unit dedicated to providing transparent journalism from Sky News. We gather, analyse and visualise data to tell data-driven stories. We combine traditional reporting skills with advanced analysis of satellite images, social media and other open source information. Through multimedia storytelling we aim to better explain the world while also showing how our journalism is done.
