Sir Keir Starmer has warned Reform UK could win in Wales if Plaid Cymru and the Welsh Conservatives agree to a "backroom stitch-up" with Nigel Farage.

The Prime Minister, who joined delegates at Welsh Labour's annual conference in Llandudno this morning, also accused the Clacton MP of having "no plan" for the principality.

He said: "Next year it's a clear choice, two Labour Governments working together for the people of Wales, continuing on the course of change that we've set, with almost £5billion extra for Wales, money for employment, support and training - to break down the barriers to opportunity - money for neighbourhoods - driving growth and restoring pride in your community - more money for the NHS, for infrastructure, more money for Wales.

"Or there's the other option. The risk of rolling back all the progress we're making. A return to the chaos and division of the last decade. A backroom stitch-up between the Tories, Reform and Plaid. And once again it will then be working families left to pick up the bill, whether that's with Reform or with Plaid's determination to cut Wales off from the rest of the country."

Despite Starmer warning about a Cardiff Bay, Labour has held power in the Welsh Parliament by being propped up by both the Liberal Democrats and Plaid Cymru in recent years.

A co-operation agreement between then-First Minister Mark Drakeford and then-Plaid leader Adam Price was also signed in 2021, with the deal only collapsing following a donor row last year.

And some senior figures in Welsh Labour have already publicly spoken out about creating a progressive pact to halt Reform's march to power.

Ex-First Minister Mark Drakeford urged Labour, Plaid Cymru and the Liberal Democrats to come together to halt Reform UK ending Labour's century-long stranglehold on Wales.

Responding to the Prime Minister's attack, a Reform UK source in Wales told GB News: "Desperation. People can see right through it.

"Labour Ministers have openly talked about forming their own coalition of chaos just to stop Reform UK from delivering the real change Wales needs.

"After 26 years of Labour’s decline, our communities are worse off, our services are failing, and families are paying the price.

"Wales doesn’t need more tired slogans or backroom deals. It needs bold, common-sense Reform to put working people first again."

And Plaid Cymru leader Rhun ap Iorwerth has already ruled out working with Reform UK in Cardiff Bay after the 2026 Welsh Parliament Election.