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Keir Starmer resigned on Monday morning. Fewer than two years after a 172-seat majority, he leaves behind Labour’s third leadership contest in a decade, a fiscal position worse on every measurable dimension. Financial markets barely flinched. When Britain is on its sixth Prime Minister in seven years, political churn stops being a shock. It becomes the baseline.

Andy Burnham is the frontrunner. Nominations open on 9 July. Richard Hughes — who resigned as OBR Chair in December 2025 after the OBR prematurely published Budget details online — is advising the campaign alongside Andy Haldane and Jim O’Neill. The arithmetic is brutal: income tax, VAT and employee NI are manifesto-locked; employer NIC is already 15%; defence needs tens of billions more; welfare is one of the few remaining levers — and Burnham’s instincts run the wrong way.

The incoming prime minister inherits not a blank slate but a trap: weak growth, high debt, locked taxes, rising defence costs, welfare pressure and a gilt market with no patience for fantasy economics.

Tuesday’s S&P Global/CIPS flash PMI confirmed the problem. The composite came in at 49.4: contraction for a second month. Services fell to 48.7. Manufacturing held at 53.1, but it is only around one-tenth of UK GVA. Set against services inflation still at 3.7%, it leaves the Bank of England with a much harder problem than the 30 July rate decision will suggest.

Then Friday brought two shocks. An IRGC drone struck a Singapore-flagged vessel in the Strait of Hormuz; Trump declared Iran in breach of the Islamabad Memorandum; US Central Command struck four Iranian targets the following day. Separately, Trump threatened 100% tariffs on countries levying digital services taxes on US tech companies. Britain has had one since 2020. Labour cannot afford to lose the revenue. It cannot afford the tariff wall either. Reeves will have to choose.

On Friday 26 June, US forces struck four Iranian targets — missile, drone and radar installations on the Iranian coastline — after a drone hit a commercial cargo vessel in the Strait of Hormuz. The Islamabad Memorandum, signed at Versailles on 17 June, lasted nine days. Oil, shipping rates and Gulf-facing equity exposures are the immediate transmission mechanism for Monday’s open.

Simultaneously, Trump threatened 100% tariffs on countries with a digital services tax. Britain’s 2% DST has been in place since 2020. The July 4 US-EU agreement caps most EU exports at 15% but excludes digital taxes — that carve-out is now the pressure point. The DST yields roughly £700m a year. Reeves has a choice. Trump has followed through before.

A £100k-a-year council pension would cost £1.3m–£1.8m to buy on the open market. That number has nearly tripled in five years.