A significant cross-party alliance is emerging within the UK Parliament, mobilizing to counter potential British entanglement in US-Israeli military operations against Iran. This coalition unites the resurgent Green Party, the newly formed left-wing Your Party led by Jeremy Corbyn, the parliamentary Independent Alliance, and dissenting Labour backbenchers.
The movement gained concrete form when Corbyn, the former Labour leader, introduced the Military Action Bill on Thursday. This legislation, garnering support across party lines, would mandate parliamentary approval for any foreign military use of British bases. The bill directly challenges Prime Minister Keir Starmer’s recent decision to permit US forces to utilize UK installations for targeting Iranian missile sites.
Co-sponsorship of the bill includes Green MPs Ellie Chowns and Hannah Spencer—fresh from her landmark by-election victory in Gorton and Denton—alongside Independent Alliance MPs Adnan Hussain and Ayoub Khan. They are joined by prominent Labour rebels including Diane Abbott, John McDonnell, and Richard Burgon.
While the bill’s passage remains unlikely, it signifies growing political pressure on the government from both flanks. Starmer faces simultaneous criticism from Reform UK and the Conservative Party, who advocate for stronger support of US-Israeli actions and unrestricted base access.
The proposed legislation would establish stringent requirements for parliamentary authorization of British military deployments and equipment use in armed conflicts. Crucially, it would force the withdrawal of permission if such approval is not granted.
This parliamentary maneuver coincides with notable shifts in Britain’s political landscape. The Greens have surged to second place in national polls following Spencer’s electoral breakthrough, while Corbyn’s Your Party has established its leadership structure with him as parliamentary leader.
Both Corbyn and Green co-leader Zack Polanski have spearheaded opposition to UK involvement, with Polanski condemning Starmer’s ‘utter inability to stand up to Donald Trump’ and warning against ‘another illegal war in the Middle East.’ Corbyn accused the Prime Minister of appeasing Trump at the expense of international law.
Their stance appears aligned with public sentiment. Recent YouGov polling indicates that 49% of Britons oppose US military action against Iran (versus 28% support), while exactly half disapprove of allowing US forces to use UK bases, with only 30% in favor. This suggests the left-wing bloc may better represent public opinion than the government’s conservative critics.