Boris Johnson’s Tories have suffered a humiliating by-election defeat as the Liberal Democrats secured a historic win in Chesham and Amersham.

Lib Dem Sarah Green is the country’s newest MP after winning the seat, which has been a Conservative stronghold since its creation in 1974.

The contest was triggered by the death of former Cabinet minister Dame Cheryl Gillan, who took the seat with a majority of 16,233 in the 2019 general election – some 55% of the vote.

The stunning result saw Ms Green defeat Tory Peter Fleet by a majority of 8,028.

Ms Green said she was “humbled by the faith you have placed in me” and promised she would hold the Government to account.

“This Conservative Party has taken people across the country for granted for far too long,” she said.

Green candidate Carolyne Culver got 1,480 votes, with Labour’s Natasa Pantelic receiving just 622.