Starmer’s Iran Gamble Pays Off in the Polls — PM’s Approval Surges 26 Points Among Voters Who Know He Defied Trump

New polling data reveals a remarkable dynamic at the heart of British politics: Keir Starmer’s net approval rating jumps from minus-40 to minus-14 — a 26-point surge — when voters are reminded of his opposition to Trump’s Iran war. The problem? Most voters still don’t know. And 47% of those who do think he has handled the crisis badly. The Iran dividend is real, but it may not be enough to save Labour from the local election reckoning on May 7.

Keir Starmer has spent the last five weeks walking one of the most treacherous tightropes in modern British politics. He drew a line against Trump’s Iran war, declared “this is not our war,” convened a 40-nation Hormuz coalition, and pivoted dramatically toward Europe — all while trying not to completely destroy the transatlantic relationship that Britain’s defence and intelligence architecture depends upon. The question has always been: is any of this actually working?

The 26-point swing

The answer, buried in a fascinating new British Brief analysis of polling data, is a qualified yes. When voters are surveyed without being reminded of the Iran dispute, Starmer’s numbers are dire: 57% hold negative views of the Prime Minister, just 17% are positive, producing a net approval of minus-40. That is catastrophic territory — worse than where Boris Johnson was in the final months of Partygate.

But when the same voters are told about Starmer’s refusal to support Trump’s military action in Iran, something remarkable happens. Negative views drop to 42%, positive opinions rise to 28%, and the net rating improves to minus-14. That 26-point swing suggests that Starmer’s Iran stance is his single most popular policy position — and that the public is far more sympathetic to his defiance of Washington than his overall approval numbers suggest.

The awareness problem

The catch is that most Britons do not connect Starmer with the Iran stance. YouGov data shows that while over 80% of the public are concerned about the impact of the Iran conflict on fuel and energy prices, far fewer can articulate what the Prime Minister has actually done about it. Starmer’s team has been cautious about over-claiming credit — partly because the situation is so volatile, and partly because anything that looks like politicising a war tends to backfire.

This creates a cruel paradox. Starmer’s most popular policy is also his least visible one. The local elections on May 7 will be fought primarily on domestic issues — the cost of living, diesel at 187p a litre, NHS waiting times exacerbated by the upcoming BMA strike — and Labour’s opponents are under no obligation to remind voters that their PM stood up to Donald Trump.

The Chatham House verdict

Chatham House, the foreign affairs think tank, published an assessment this week arguing that Starmer’s handling of Trump and Iran “reflects public opinion but shows the limits of UK power.” The British public overwhelmingly opposes the use of UK bases for strikes against Iran, according to Middle East Eye polling — a position Starmer has upheld. But the same public also wants lower fuel prices, a functioning economy and a Prime Minister who can actually influence events rather than merely commentate on them.

The Ipsos data is damning on this front: 47% of Britons say Starmer has managed the UK’s response to the conflict badly, versus 34% who say he has managed it well. Among Labour and Liberal Democrat voters, the numbers are more favourable — 53–55% approve — but among the swing voters Starmer needs to hold, the picture is bleak. They like the principle of standing up to Trump. They do not like the fact that they are paying £100 to fill their cars.

Reform and the local election threat

None of this exists in a vacuum. Reform UK is polling between 26% and 32% nationally and is projected to take control of county councils in Essex, Norfolk and Suffolk for the first time in history. The party’s message is brutally simple: the establishment has failed you, from the war to the economy to immigration. Starmer’s Iran stance may earn grudging respect from liberal commentators, but it does not pay the gas bill — and Reform’s Nigel Farage has bet £5 million that voters will punish the government regardless.

Labour insiders privately acknowledge that the May 7 elections will be grim. The party is expected to lose hundreds of council seats, particularly in northern metropolitan boroughs where Reform is surging and in Muslim-majority wards where ‘Your Party’ is fielding 250 candidates to punish Labour over its broader Middle East positioning. The Iran approval boost is a life raft, not a lifeboat.

The strategic calculation

Starmer’s team is betting on the long game. If the war ends — whether through the Islamabad Accord, an exhaustion of American patience, or sheer economic pressure — and oil prices fall, the PM who stood apart from Trump will be the PM who was proved right. That narrative could be enormously powerful heading into 2028 or 2029. But if the war drags on, if Britain tips into recession this summer, and if voters decide that “this is not our war” also means “this PM cannot protect us from its consequences,” then the 26-point Iran dividend will be a footnote in the story of Labour’s collapse.

For now, the polls suggest Starmer has found the right instinct but not the right volume. He needs to be louder about what he has done — the Hormuz coalition, the EU pivot, the refusal of base access — without looking like he is exploiting a conflict that is killing people. It is a communications challenge as much as a policy one, and with 31 days until the local elections, time is running out to close the awareness gap that is the difference between a 26-point boost and a 40-point deficit.