A petition calling for a public inquiry into Britain's "complicity in Israel's genocide in Gaza" has crossed 100,000 signatures on the UK Parliament website, triggering a procedural requirement for lawmakers to consider the topic for debate. The petition was launched by Jennifer Forbes, chair of the executive committee of Your Party, the left-wing party led by former Labour leader Jeremy Corbyn. The petition demands an inquiry into "any British involvement in Israeli operations in Gaza," including the sale and supply of weapons, surveillance aircraft, and the use of Royal Air Force bases. Critically, signatories want an inquiry with the power to question government ministers and officials involved in decision-making around UK support for Israel's war. The UK's material role in the conflict is not speculative. A 2024 Al Jazeera investigation revealed Britain provided military support to Israel through an air bridge vital to sustaining the intensity of the war on Gaza. UK-based companies and factories supply crucial parts found in jets used to bomb the territory. These are supply chains, not abstractions. The political landscape has shifted since July, when Prime Minister Andy Burnham assumed leadership. Burnham acknowledged the ruling Labour Party "got wrong" its position on Israel and accepted it caused "huge hurt." This is a notable rhetorical break from prior Labour positioning, though experts note the policy shift remains partial. The petition mechanism itself should be understood clearly: it does not compel action. Parliament is required only to consider the topic for debate. Other active petitions with more than 100,000 signatures cover reducing the pension age and opposing the addition of folic acid to flour. The threshold is a democratic pressure valve, not a legislative trigger. Corbyn framed the effort in stark terms: "We are not going away until we get this inquiry. We want the truth, and we want justice." The campaign represents a sustained effort by the UK left to force accountability on arms exports and military facilitation, using parliamentary procedure as leverage against an allied government reluctant to open its decision-making to scrutiny. The core question is whether procedural momentum translates into political consequence. The petition forces visibility, but Parliament has ample precedent for acknowledging petitions without meaningful follow-through. The real test is whether the political cost of dismissal now exceeds the cost of inquiry — and that calculus depends on how much further public opinion moves against UK complicity.