Last October, a Senedd by-election took place in Caerphilly, South Wales. As long as the seat had existed, for over 100 years, it had belonged to Labour.

But that night, Welsh Labour fell to third place. Reform galloped into second. And after fighting in 18 elections since the 1980s, Plaid Cymru’s Lindsay Whittle took first place with almost 50 per cent of the vote.

Is this a stark demonstration of how politics in Wales is changing?

Plaid Cymru leader Rhun Ap Iorwerth joins Megan Kenyon.

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Can Plaid Cymru defeat Reform again?

The Politics Show