History of the Green Party of England and Wales of Deputy Leader. The Green Party fielded more than 300 candidates for the 2010 general election. Caroline Lucas became the first Green candidate to gain a seat in Westminster, after being elected MP for Brighton Pavilion by a margin of 1,252 votes. The following week 600 new members had joined the Green Party bringing total membership to over 11,000. In previous years 600 new members was high for a whole year. On 24 May 2012, the six Green Party councillors elected to Stroud District Council formed a power sharing administration (a "constructive cooperation") with both the Labour Party and the
Brighton Pavilion (UK Parliament constituency) and former union worker, as their candidate in June 2007. This meant that, distinctively, all of the four leading parties in the constituency had female candidates. In 2010, Labour's share of the vote fell by 6.5%, and Lucas, by then leading the Green Party, won the seat. In contrast to national results, the Conservative and Liberal Democrat share of the vote fell. Lucas retained the seat for the Green Party at the 2015 general election with an increased majority. Purna Sen, who held senior roles at the Commonwealth, LSE and Amnesty International, was selected to contest the seat for Labour.