Key Points
- Jeremy Corbyn, MP for Islington North and leader of the new left‑wing group Your Party, has tabled the Military Action Bill in the House of Commons to limit the government’s power to commit UK forces to war.
- The bill would require parliamentary approval for the deployment of UK armed forces and military equipment in armed conflict, and for any foreign military use of UK bases or equipment.
- It would also require the immediate withdrawal of permission for foreign forces to use UK bases if Parliament does not grant approval.
- The measure is being presented as a parliamentary “war powers” check, tightening procedure after concerns that the UK could be drawn into a broader conflict with Iran via US‑led strikes.
- The bill was co‑sponsored by Green MPs Ellie Chowns and Hannah Spencer, alongside members of the Independent Alliance and rebel Labour backbenchers, forming a broad anti‑war, left‑wing bloc inside Parliament.
- Writing on the social‑media platform X, Corbyn urged Prime Minister Keir Starmer to follow Spain and say “no way, absolutely not” to involvement in what he described as an “illegal war”.
- A YouGov survey found that 49% of Britons oppose US military action against Iran, compared with 28% in favour, highlighting a public‑opinion gap over escalation.
- Starmer has publicly stated that the UK should not join any war without a “lawful basis and a viable, thought‑through plan”, insisting that clarity and restraint are required in the Iran‑related crisis.
- The tabling of the Military Action Bill marks the parliamentary debut of Your Party as a distinct left‑wing force, pushing legal constraints on executive war powers.
London (Britain Today News) March 4, 2026 – Former Labour leader and Your Party chief Jeremy Corbyn has tabled a new Military Action Bill in the House of Commons, aiming to strip the prime minister of unchecked authority to send UK troops into armed conflict and to require MPs’ consent for the foreign use of British military bases. The move follows heightened geopolitical tensions over the Middle East and fresh criticism of executive war powers, positioning Corbyn and his cross‑party allies as the core of a newly formalised anti‑war alliance in Parliament.
Supporters of the bill argue that it would, for the first time, enshrine in law a parliamentary “war powers” check, after repeated complaints that governments have previously bypassed or shortcut debate on military action. Critics, including some within the governing Labour Party, warn that overly rigid rules could slow the UK’s ability to respond swiftly to fast‑moving security threats, but backers say the danger of unaccountable escalation is greater.
What is the Military Action Bill trying to do?
The Military Action Bill, introduced by Corbyn as a private member’s bill, seeks to amend the constitutional balance between the executive and Parliament on the use of force. Under its terms, any decision to deploy UK armed forces or military equipment into armed conflict would require explicit parliamentary approval before action is taken.
As reported by Anadolu Ajansı, the bill would also require the government to seek MPs’ consent before granting permission for foreign militaries to use UK bases and equipment for armed conflict, and to withdraw that permission immediately if Parliament does not approve. This clause is framed as a response to concerns that British bases could be used as staging‑off points for strikes by other countries, notably the United States, without a clear domestic mandate.
Commenting on the measure, Corbyn wrote on the platform X, according to his own post that was widely cited by outlets including Anadolu Ajansı, that
“The Prime Minister should follow in the footsteps of Spain and say: no way, absolutely not, we will not be involved in this illegal war in any way whatsoever.”
He framed the bill as a way to prevent the UK being drawn into what he and allies describe as an illegal war of aggression, particularly in the context of Iran‑related tensions.
Who is backing the bill in Parliament?
The Military Action Bill is not just a solo effort by Corbyn; it has been co‑sponsored by Green Party MPs Ellie Chowns and Hannah Spencer, as well as by members of the Independent Alliance and rebellious backbenchers from the governing Labour Party. According to coverage by Middle East Eye, the grouping sees itself as an emerging anti‑war bloc pushing for stricter parliamentary control over foreign‑policy and security decisions.
The alignment of Your Party, the Greens, independents, and dissenting Labour MPs marks the first formal parliamentary grouping led by Corbyn since he sat as an independent and then formed Your Party. The coalition’s objective is to use the bill as a constitutional test case, hoping to force votes on deployment and base‑use decisions that are currently treated as executive prerogatives.
This cross‑party effort also reflects a broader unease among MPs about the precedent of allowing allies to operate from UK soil without transparent parliamentary scrutiny, a concern amplified by recent decisions to permit the US use of British bases for targeting Iranian missile sites.
How does the public feel about military action on Iran?
The bill’s timing follows a YouGov survey cited by Anadolu Ajansı, which showed that 49% of respondents oppose US military action against Iran, while only 28% support it. Those findings suggest a cautious or sceptical mood among the British public toward deeper military involvement in the Middle East, giving Corbyn’s alliance a potential political niche.
Campaigners behind the bill argue that such polling reflects a demand for greater accountability and that the current system of executive‑led war powers does not reflect public opinion on the use of force. They contrast this with the political stance of Prime Minister Keir Starmer, who has distanced himself from Pentagon‑driven escalation but has still allowed the US to use UK bases for certain operations.
What has Keir Starmer said about going to war?
Prime Minister Keir Starmer has repeatedly stated that the UK will not join a war without a clear legal basis and a detailed plan, addressing questions over why Britain has not taken part in offensive strikes against Iran. During Prime Minister’s Questions Time on March 4, 2026, he said:
“What I was not prepared to do on Saturday was for the UK to join a war unless I was satisfied there was a lawful basis and a viable, thought‑through plan. That remains my position.”
Starmer added, as reported by Sky News, that
“We need to act, therefore, with clarity, with purpose, and with a cool head,”
emphasising a cautious, rules‑based approach to the Iran‑related crisis. At the same time, however, he has come under pressure from more hawkish voices, including the United States, for not joining offensive strikes—a tension that underscores the political tightrope the government faces.
Corbyn’s allies point to this gap between executive restraint and the absence of legal constraints as the core reason for their bill. They argue that even a prime minister who promises restraint should be bound by parliamentary votes, not left to interpret legality and strategy alone.
How does this compare to past war‑powers debates?
The current push echoes long‑running debates over the so‑called “war powers act”, which Corbyn and others have called for since at least 2016. In 2018, as Labour leader, Corbyn publicly urged then‑prime minister Theresa May to abandon plans for air strikes without a proper parliamentary vote, arguing that a formal war‑powers check was needed to prevent governments from acting in the country’s name without scrutiny.
Historically, ministers have resisted such moves, arguing that codifying war powers would limit their flexibility and expose them to legal challenges over the definition of “combat” versus “training” missions. The Military Action Bill now represents a renewed attempt to achieve, in legislative form, what earlier governments have refused to deliver.
Advocates point to the US War Powers Resolution as a partial model, under which the president must notify Congress within 48 hours of committing armed forces to conflict, though that framework has also been heavily criticised for its limitations. The UK effort, by contrast, seeks to tie approval for deployments and base use directly to prior parliamentary consent, a step beyond the current ad‑hoc system.
Could the bill actually become law?
For the Military Action Bill to pass, it must navigate the crowded parliamentary diary and win backing from both opposition and government ranks, a hurdle that many private member’s bills fail to clear. Its prospects depend on whether Labour whips ultimately tolerate it progressing or move to block it, as the government already controls the majority and the legislative timetable.
If the bill is not enacted, proponents still see value in forcing public debates and test‑votes on the principle of parliamentary control over war powers, which could influence future guidance or codes of conduct even without new statute. For your party, Greens, independents and Labour rebels, the bill is both a constitutional intervention and a political statement amid a turbulent security environment.
As the debate plays out, the UK may face a fundamental choice: whether to reinforce the prime minister’s discretion in matters of war, or whether to, as Corbyn’s allies argue, tie the government’s power to use force to the explicit will of Parliament.
