More than 2,100 parkrunners, volunteers and community supporters have written to their MPs this month urging the United Kingdom government to defend trans-inclusive community organisations after the conservative legal group Alliance Defending Freedom UK threatened legal action against parkrun and several other open participation bodies. The coordinated letter campaign, organised by the Good Law Project and a coalition of LGBTQ+ sporting organisations, is the largest single mobilisation of the parkrun community on a political issue since the event's founding in 2004.
Alliance Defending Freedom UK contends that parkrun's longstanding policy of recording the gender a participant identifies with — rather than their sex assigned at birth — falls foul of the Supreme Court's April 2025 ruling on the definition of 'sex' under the Equality Act. Parkrun, which describes itself as "a free, weekly, timed 5K open to all", says its policy has not changed and that the events have always been built around participation rather than competition.
The legal threat lands at a moment of remarkable community scale. The latest weekly returns show 2,265 parkrun events and 506 junior parkruns took place worldwide, with more than 403,000 adult and 46,000 junior finishers and around 53,000 volunteers turning out across a single Saturday and Sunday. The United Kingdom programme alone now exceeds 800 weekly events; the 2,100th event in the country's history is set to be staged this Saturday in Llanelli, south Wales.
Parkrun's chief executive Russ Jefferys issued a short statement noting that the organisation "will defend our open and welcoming approach". The statement was echoed by a long list of grassroots clubs and individual event teams, with venues from Bushy Park in London to Tooting Common, Cardiff Bay and Glasgow's Pollok parkrun publishing co-signed support messages on social media. Several elite athletes including former British marathon record holder Charlotte Purdue have also publicly backed parkrun's stance.
The Department for Culture, Media and Sport has not yet responded substantively to the letter campaign, although the Equality and Human Rights Commission is expected to issue updated participation guidance for community sport later in the summer. For runners turning up at their local parkrun this Saturday, the event itself will look as it always has: a 5K start at 09:00, a volunteer-run finish funnel, and free coded results emailed within a few hours. The organisation's leadership has been firm that, whatever legal manoeuvring continues in the background, the on-the-ground event will not change.