British Left left-wing party in the UK, by membership, is the Green Party of England and Wales. , membership was 45,643. The party has one Member of Parliament, Caroline Lucas, who was a Co-Leader of the Green Party of England & Wales; and was first elected as the MP for Brighton Pavilion at the 2010 general election. The other two political parties on the left and with representation in parliament are the centre-left Scottish National Party (SNP) and the left-wing Plaid Cymru. The SNP are only active in Scotland and Plaid are only active in Wales. The SNP has 35 MPs and
Green Party of England and Wales of the London Assembly. Brighton Pavilion was the Green Party's first and only parliamentary seat to date, won at the 2010 general election and held in 2015 and 2017. As with other small parties, representation at the House of Commons has been hindered by the first-past-the-post voting system. The party's first life peer was Baron Beaumont of Whitley, who left the Liberal Democrats and joined the Green Party in 1999. He sat as a Green until his death in 2008. As of December 2015, Baroness Jones of Moulsecoomb is their only representative in the House of Lords. Since the first