What is 2021 Chesham and Amersham by-election?
{{Infobox election | election_name = 2021 Chesham and Amersham by-election | type = parliamentary | seats_for_election = [[Chesham and Amersham (UK Parliament constituency)|Chesham and Amersham]] constituency | ongoing = | previous_election = 2019 United Kingdom general election | previous_year = 2019 | next_election = Next United Kingdom general election | next_year = ''Next'' | election_date = 17 June 2021<ref>{{Cite web|title=Election timetable and notices|url=https://www.buckinghamshire.gov.uk/your-council/council-and-democracy/election-and-voting/election-timetable-and-notices/|access-date=17 May 2021|website=Buckinghamshire Council|language=en-GB|archive-date=17 May 2021|archive-url=https://web.archive.org/web/20210517022522/https://www.buckinghamshire.gov.uk/your-council/council-and-democracy/election-and-voting/election-timetable-and-notices/|url-status=dead}}</ref> | candidate1 = '''[[Sarah Green (politician)|Sarah Green]]''' | image1 = | party1 = Liberal Democrats (UK) | last_election1 = 26.3% | popular_vote1 = '''21,517''' | percentage1 = '''56.7%''' | swing1 = {{increase}} 30.4% | candidate2 = Peter Fleet | image2 = | party2 = Conservative Party (UK) | last_election2 = 55.4% | popular_vote2 = 13,489 | percentage2 = 35.5% | swing2 = {{decrease}} 19.9% | map_image = CheshamAmersham2007Constituency.svg | map_size = 250px | map_caption = Location of [[Chesham and Amersham (UK Parliament constituency)|Chesham and Amersham]] within [[Buckinghamshire]] | title = [[Member of Parliament (United Kingdom)|MP]] | posttitle = | before_election = [[Cheryl Gillan]] | before_party = Conservative Party (UK) | after_election = [[Sarah Green (politician)|Sarah Green]] | after_party = Liberal Democrats (UK) }} A [[UK Parliamentary by-elections|by-election]] was held in the United Kingdom Parliament constituency of [[Chesham and Amersham (UK Parliament constituency)|Chesham and Amersham]] on 17 June 2021. This is because the previous Member of Parliament, [[Cheryl Gillan|Dame Cheryl Gillan]], had died on 4 April 2021.