Sir Keir Starmer told MPs he will not yield to pressure from Washington over Greenland, after President Trump linked a 10% tariff on UK goods from 1 February-rising to 25% from 1 June-to support for a US takeover. In Davos, Mr Trump also said he will not use force and called for talks. Chancellor Rachel Reeves insisted Britain will not be “buffeted around” and said last year’s UK‑US trade deal stands. The politics is loud, but the market question is simple: which UK exports are exposed if the tariffs land. (theguardian.com)

The United States is the UK’s largest single-country export market. In 2024, UK goods exports to the US totalled about £59.3bn, led by machinery and transport equipment (£29.1bn), chemicals (£10.8bn, including £6.6bn of medicines) and cars (£9.0bn). Services matter even more: £137bn of UK services were sold to US customers, with business, financial and tech services dominant. Goods tariffs would bite first; services are not subject to border tariffs but could face indirect pressure through slower demand. Figures are from the Office for National Statistics. (ons.gov.uk)

Automotive is the clearest risk case. The 2025 UK‑US deal cut US tariffs on up to 100,000 UK‑made cars to 10% and removed 25% duties on UK steel and aluminium, while leaving a baseline 10% on most other goods. Above that 100,000‑vehicle quota, the car rate snaps back to 27.5%. If a new 10% tariff is imposed across the board from 1 February, ministers say the 2025 carve‑outs will still apply-but Washington has not clarified whether any fresh tariff would override or “stack” on top of existing rates. Exporters should plan on quota monitoring and pricing for potential double-counting until guidance lands. (gov.uk)

Pharmaceuticals and wider chemicals-together more than £10bn of UK goods sold into the US in 2024-would face immediate margin pressure under a flat 10% at the border. Many mid‑sized UK drug makers and speciality chemical firms ship under supply contracts that fix US list prices in dollars; a tariff would either squeeze UK margins or force renegotiation with distributors. The ONS data underline the scale: medicines alone contributed roughly £6.6bn of exports last year. (ons.gov.uk)

Aerospace has partial protection. The 2025 deal removed 10% tariffs on many UK engines and parts, a boost for prime contractors and hundreds of UK SMEs feeding US programmes. Any fresh blanket tariff would test those exemptions. Until the text is published, treat engines and certified parts as likely to remain covered but verify HS codes and end‑use paperwork on every shipment. Rolls‑Royce and tier‑two suppliers benefited when the reductions kicked in last year; continuity now depends on whether Washington treats the new measure as separate policy. (gov.uk)

Services aren’t tariffed at the border, but they are not insulated. The UK sold £137bn of services to the US in 2024-consulting, finance, insurance, IT and creative work. A tariff shock can slow US capex, cut discretionary projects and delay cross‑border hires or visas, which in turn hits billable hours for UK firms. For CFOs, the practical takeaway is to update revenue sensitivity to a US slowdown rather than a customs duty. (ons.gov.uk)

What should exporters do today? Front‑load US‑bound shipments where possible before 1 February to avoid border uncertainty; convert Delivered Duty Paid contracts to terms where the importer of record pays any tariff; and check product classification line by line against the 2025 carve‑outs. For autos, track the 100,000‑vehicle quota utilisation weekly. For parts and chemicals, review rules of origin and US customer pricing mechanics now-reopening terms is easier before invoices are hit with duties. This is dull work, but it protects cash.

On rough maths, a 10% tariff applied across the UK’s 2024 goods exports to the US would imply about £6bn a year in extra costs; at 25% from June it would be closer to £15bn, before any carve‑outs or pass‑through. Actual impact will be lower if the 2025 deal’s protections survive, but higher for firms with thin margins or dollar‑denominated fixed prices. That is why mid‑sized manufacturers should model both the 10% and 25% scenarios as base cases. Market Pulse UK’s calculation uses ONS export values. (ons.gov.uk)

Europe is preparing its own guardrails. The European Parliament has moved to freeze the separate EU‑US trade deal, and Brussels has signalled it could deploy the Anti‑Coercion Instrument-its so‑called trade “bazooka”-if tariffs are imposed, a process that takes months to activate. That doesn’t directly shield UK exporters outside the EU framework, but it shapes the negotiation climate London is operating in. (theguardian.com)

This row did not start in a vacuum. Mr Trump attacked the UK’s £3.4bn Chagos agreement-under which sovereignty transfers to Mauritius while the Diego Garcia base remains on a long lease-as proof of UK “weakness”, despite earlier signals of support from his administration. Downing Street argues the treaty secures the legal footing of a critical base; Parliament is still finalising enabling legislation. (euronews.com)

The rhetoric on Greenland has escalated just as Treasury Secretary Scott Bessent told reporters in Davos the UK was “letting us down” over Diego Garcia and urged Europe not to retaliate on trade. Markets heard two messages: no force against Greenland, but tariffs if allies resist. For boardrooms, that equals planning for policy volatility-supply chain, pricing and FX-through at least the first half of 2026. (theguardian.com)

Near‑term waypoints are clear. The tariff clock starts on Saturday 1 February if Washington follows through, with a step‑up threatened on Sunday 1 June. Sir Keir meets Denmark’s Mette Frederiksen this week to reaffirm London’s position that Greenland’s status is for Greenland and the Kingdom of Denmark alone. Expect more heat than light; price in noise and keep shipping plans flexible. (theguardian.com)