LONDON — In less than two years, Britain's governing Labour Party has gone from a landslide election victory to a historic rout at last week's local and regional votes that has put Prime Minister Keir Starmer's job on the line.

Two years after the British Labour Party’s “landslide” win, a crushing defeat threatens its future

Keir Starmer led the UK Labour Party to a landslide victory in 2024. Now that leadership is being tested.