Graph of party membership. Party; Membership. Reform UK; 268,000. Labour Party; 250,000. Green Party of England and Wales; 195,000. Conservative Party; 123,000. Liberal Democrats; 60,000. Scottish National Party (SNP); 56,011. Your Party; 55,000.

Graph of Green Party of England and Wales membership. Starts in July 2025 at about 60,000. Starts slowly climbing at the start of the GP leadership election, rising faster after Zack Polanski becomes leader, and climbs very steeply in October 2025 to overtake the Conservative Party and double membership with 150,000 members. Then growth slows but climbs steadily until the present day, with 195,000 members in total.