Shadow Treasury Minister Clive Lewis announces his candidacy to succeed Jeremy Corbyn as Leader of the Labour Party. He is the second person to make this announcement, after Shadow Foreign Secretary Emily Thornberry.
The Leader of the UK's Labour Party, Keir Starmer, sacks his Shadow Secretary of State for Education Rebecca Long-Bailey for sharing an article on social media that says American police were trained by Mossad to use the knee-on-neck restraint that killed George Floyd, which Israeli police say is false.
British MP Ian Austin quits Labour over a "culture of extremism, anti-semitism and intolerance" within the party under Jeremy Corbyn, becoming the ninth Labour MP to quit this week. However, unlike the others, he will not be joining The Independent Group.
The Communist Party of Britain announces it will not field any candidates in the upcoming general election for the first time since its formation in 1920, and endorses Labour leader Jeremy Corbyn, saying victory for Mr Corbyn at the general election in June would be “the first step towards a formation of left-led government at Westminster”.
Heidi Alexander, Gloria De Piero, Ian Murray, Lilian Greenwood, Lucy Powell, Kerry McCarthy, Seema Malhotra, Vernon Coaker, Charlie Falconer, Karl Turner and Chris Bryant resign en masse from the Labour Shadow Cabinet of Jeremy Corbyn in protest at Jeremy Corbyn's leadership over the EU referendum, and the firing of Hilary Benn.
Thousands, including some from Australia, protest in London, England, against the renewal of the United Kingdom's Trident nuclear deterrent system, the largest anti-nuclear rally since 1983. Leader of the Labour Party Jeremy Corbyn, Scottish National Party leader and First Minister of Scotland Nicola Sturgeon, the Welsh Plaid Cymru Party, and the Green Party participated in the march. A parliamentary vote on renewing Trident is expected this year.