Chesham and Amersham has fallen. The once uber-Tory Chilterns citadel has been snatched by the Lib Dems, with local campaigners citing planning reform and HS2 as the main drivers for their success.

After the ginormous swing — from a 16,000 majority to an 8,000-vote deficit — fears are growing that the Tories’ planning reforms might become a victim to demographic subsidence.