Plaid Cymru have won the by-election in the Senedd seat of Caerphilly for the first time.

The Welsh nationalist party secured 15,960 votes - and candidate Lindsay Whittle cried as the result was announced.

Mr Whittle is 72 years old and had stood as a Plaid candidate 13 times since 1983. He will now hold the seat until the Senedd elections next year.

This by-election was widely regarded as a two-horse race between Plaid Cymru and Reform UK, and the result marks a considerable blow for Nigel Farage.

His candidate Llyr Powell received 12,113 votes - denying a victory that would have strengthened claims that Reform can convert a large lead in opinion polls into election wins.

Nonetheless, the party's performance is a marked improvement on 2021, when it received just 495 votes.

More than anything, the result is a humiliating and historic defeat for Labour, who had held Caerphilly at every Senedd election since it was created in 1999 - as well as the Westminster seat for over a century.

Its candidate Richard Tunnicliffe secured 3,713 votes and finished in third place, with Welsh Labour describing it as a "by-election in the toughest of circumstances, and in the midst of difficult headwinds nationally".

Turnout overall stood at 50.43% - considerably higher than during the last ballot back in 2021.

Giving his acceptance speech after the result was confirmed, Mr Whittle described how he had been "absolutely heartened" by how many young people were involved in the by-election - and said the result sends a clear message.

He said: "Listen now Cardiff and listen Westminster - this is Caerphilly and Wales telling you we want a better deal for every corner of Wales. The big parties need to sit up and take notice.

"Wales, we are at the dawn of new leadership, we are at the dawn of a new beginning - and I look forward to playing my part for a new Wales, and in particular, for the people of the Caerphilly constituency. I thank you with all my heart."

Mr Whittle quipped Plaid's victory "was better than scoring the winning try for Wales in the Rugby World Cup".

And looking ahead to the next year's elections, he added: "[This] result shows what's possible when people come together to back practical solutions and protect what matters most.

"We've beaten billionaire-backed Reform and, with the same determination, we can do it again in May 2026. Caerphilly has shown the way - now Wales must follow."

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Plaid Cymru leader Rhun ap Iorweth told Sky News his party's victory is the "start of a reset of politics in Wales".

He said Plaid's goal is to take over the Senedd for the first time in May next year.

"I want to see that through now. I've made it clear, said it in my conference speech a couple of weeks ago, we have to replace Labour," he said.

"And it's not just for its own sake, it's so we get better outcomes for Wales. That's what Plaid Cymru's always about."

Cabinet office minister Nick Thomas-Symonds told Sky News that "frustrations" with the "pace of change" led to Labour's loss.

"I'm not shying away from, how disappointing the results is," he said.

"What I found on the doorsteps was a real desire for more change, a frustration about the pace of change. That was coming through to me very strongly when I was speaking to people, I think that's been reflected in the result."

Labour's deputy first minister in the Senedd, Huw Irranca-Davies, said the prime minister must "get back to bread and butter things" such as the cost of living, instead of focussing on immigration.

"There's been a lot of Reform politicians, including the candidate, who wanted to talk about nothing but small boats et cetera, he told Sky News.

"Now that's interesting because even in next May, small boats and immigration are not on the ticket in the Welsh general election for the Senedd.

"So we've got to get better. If it turns out as we think, as the polls have shown tonight, after a really good campaign with a really good Labour candidate in Richard, then we've got to talk about how do we get back to bread and butter things: cost of living, the state of the local community, the high street, the green spaces, the money in people's pockets.

"And that's a task for both Welsh Labour and UK Labour as well."

First Minister Eluned Morgan congratulated Mr Whittle on his return to the Senedd and said: "We take our share of the responsibility for this result. We are listening, we are learning the lessons, and we will be come back stronger."

The Conservatives and the Liberal Democrats were among the parties who lost their deposits.

(c) Sky News 2025: Labour dealt historic loss in Caerphilly by-election - as Plaid Cymru win seat