Â鶹ԼÅÄ

The Liberal Democrats have pulled off a stunning by-election victory, overturning a 16,000 majority in a seat that has always voted Conservative.

Leader Sir Ed Davey celebrated by knocking over a wall of blue bricks, claiming his party was now the "main threat" to the Tories in many areas.

Labour had the worst by-election result in the party's history.

Is the start of a political realignment?

Policy Editor Lewis Goodall reports from Chesham and Amersham.