The Hormuz situation is the lead. Iran has reimposed restrictions on the strait after briefly reopening it, following the US refusing to lift its blockade of Iranian ports. The IRGC fired on a tanker attempting transit on Saturday, and Reuters reported a separate attack on an Indian-flagged crude carrier. With roughly 20% of global oil supply passing through the strait, this is a direct threat to energy markets — and The Economist notes that mines, mistrust and missing ships will keep things tight for months regardless of whether the lane formally reopens.

The Guardian has a striking piece on the financial side of the Iran conflict: over $1bn in suspiciously well-timed bets accurately predicted the timing of US airstrikes, Khamenei’s assassination, and Trump’s ceasefire announcement. Sixteen separate wagers each called the February airstrike timing precisely. Lawmakers are raising insider trading concerns, though no formal investigation has been confirmed publicly.

On UK politics, Lammy has said Starmer would have blocked Mandelson’s appointment as US ambassador had he known about the security vetting concerns earlier. Starmer claims he only learned of the issue this week — which is either a significant intelligence failure or a convenient timeline, depending on your view. Separately, the FT reports Burnham allies are eyeing a route back to Westminster via NEC changes after May’s local elections, positioning him for a leadership run if Starmer continues to struggle.

HMRC is ramping up investigations into unpaid VAT by large companies as part of its push to close the tax gap. Worth watching if you have clients with complex VAT structures — the direction of travel is clearly more aggressive enforcement.

Cerebras, the AI chip startup, has filed for IPO. It has a reported $10bn-plus deal with OpenAI and an AWS partnership. This will be a test of whether the market still has appetite for AI infrastructure plays at scale.

Watch the Hormuz situation closely over the next 48 hours — oil markets open Monday and any further IRGC action over the weekend will set the tone immediately.


Sources

BBC News, Al Jazeera, Guardian, FT, TechCrunch, Politico, The Economist, Ars Technica — 2026-04-19