voted to remain in the European Union, compared with 48% in the UK as a whole. The estimated turnout of 83.6 per cent was the highest in any constituency in the UK, the only higher turnout in the referendum being in Gibraltar. In the 2019 EU Parliament elections more than 50 per cent voted for parties supporting continued UK membership of the EU, although the turnout was only 42.8 per cent. The pro-EU Liberal Democrats were the most popular party with 31.9 per cent, with the pro-Leave Brexit Party in second place on 30 per cent. Despite the seat's support for remaining in the EU, its pro-Brexit MP, Dame Cheryl Gillan, was re-elected in both generals elections held after the 2016 referendum (in the case of 2017 with her highest vote share since her first election in 1992), albeit with slightly reduced majorities. Boundaries and boundary changes 1974–1983: The Urban District of Chesham, and the Rural District of Amersham. 1983–1997: The District of Chiltern wards of Amersham Common, Amersham-on-the-Hill, Amersham Town, Asheridge Vale, Ashley Green and Latimer, Austenwood, Chalfont Common, Chalfont St Giles, Chalfont St Peter Central, Chartridge, Chenies, Chesham Bois and Weedon Hill, Cholesbury and The Lee, Coleshill and Penn Street, Gold Hill, Hilltop, Holmer Green, Little Chalfont, Little Missenden, Lowndes, Newtown, Penn, Pond Park, St Mary's, Seer Green and Jordans, Townsend, and Waterside, and the District of Wycombe wards of Hazlemere North and Hazlemere South. Hazlemere was transferred from Wycombe. Great Missenden was transferred to Aylesbury. 1997–2010: All the wards of the District of Chiltern except the wards of Ballinger and South Heath, Great Missenden, and Prestwood and Heath End, and the District of Wycombe wards of Hazlemere Central, Hazlemere East and Hazlemere West. Minor changes. 2010–present: The District of Chiltern wards of Amersham Common, Amersham-on-the-Hill, Amersham Town, Asheridge Vale and Lowndes, Ashley Green, Latimer and Chenies, Austenwood, Ballinger, South Heath and Chartridge, Central, Chalfont Common, Chalfont St Giles, Chesham Bois and Weedon Hill, Cholesbury, The Lee and Bellingdon, Gold Hill, Great Missenden, Hilltop and Townsend, Holmer Green, Little Chalfont, Little Missenden, Newtown, Penn and Coleshill, Prestwood and Heath End, Ridgeway, St Mary's and Waterside, Seer Green, and Vale. Great Missenden transferred back from Aylesbury and Hazlemere returned to Wycombe. Members of Parliament The present Member of Parliament for Chesham and Amersham is the Liberal Democrat Sarah Green MP who was elected at the 2021 by-election. Previous MPs