Lib Dem leader Sir Ed Davey, speaking at a victory rally with new MP Sarah Green, said: “Thanks to everybody who’ve helped in this by-election, we’ve worked so hard. This election sends a message to the whole country.
“The Lib Dems came here as underdogs but we campaigned and we are sending a shockwave through British politics.
“This is a great result, a huge swing to us. There are many Conservatives across the country who are now worried.
“People have been talking about a red wall, well after Chesham and Amersham and Sarah Green’s victory they’ll be talking about a blue wall, and how the Lib Dems are the main threat to the Conservatives.
“People here felt ignored and taken for granted, and we listened. Sarah Green is going to take these concerns to Parliament and hold this appalling Tory Government to account.”