Piers Corbyn, the older brother of former Labour leader Jeremy Corbyn, is among the UK’s most active conspiracy theorists and campaigners. 

A former Labour councillor and organiser, Corbyn originally made a name in the conspiracist milieu as a climate change denier, gaining press coverage for rubbing shoulders with the Holocaust denier Nick Kollerstrom at events. 

However, he gained national notoriety as a figurehead of the UK’s anti-vaccine protest movement shortly after COVID-19 lockdowns began in 2020. Corbyn organised and headed a multitude of anti-lockdown and anti-vaccine demonstrations at which he was often arrested, generating extensive press coverage. He was also arrested in 2021 for distributing leaflets likening vaccination efforts to Auschwitz-Birkenau. 

Corbyn stood in the London mayoral election in 2021 for his own political party, Let London Live (LLL), but received less than 1% of the vote. He has gone on to contest other local and parliamentary elections, although both he and other LLL candidates have reliably returned paltry results. The party was de-registered in 2023. He did, however, stand as an independent in Bermondsey and Old Southwark in the 2024 general election, receiving 1.1%.

In October 2021, a week after the murder of Sir David Amess MP, Corbyn led a small group of protesters who erected a gallows in Parliament Square. In December, Corbyn was again arrested after he told a demonstration that they needed to “get a bit more physical” with those who supported restrictions and “take down lying MPs”. He added that they needed to:  “hammer to death those scum who have decided to go ahead with introducing new fascism […] We’ve got to get a list of them […] and if your MP is one of them, go to their offices and, well, I would recommend burning them down […].” 

Corbyn has broadened his focus from COVID-19 onto other issues, reflecting a wider shift in the conspiracy theory-oriented protest movement. Corbyn spent much of 2025 attempting to shoehorn his pet issues into various movements, attending diverse events including anti-migrant demos in Epping and a protest against the new Chinese Embassy in order to rail against Digital IDs and bolster his own profile.