UK politics is moving at speed, with voter loyalties shifting and atomising in unprecedented ways.
Labor's loss in the Caerphilly by-election serves as a warning, with the winning candidate, Lindsay Whittle of Plaid Cymru, stating:
"You are on your way out after 100-plus years."
This by-election result illustrates Labor's potential loss of grip on Welsh politics, with implications for Keir Starmer and the party.
Author's summary: Labor's by-election loss in Wales shows parties must adapt to survive.