The United States and the United Kingdom run the largest two-way investment relationship in the world, and a great deal of what moves between them urgently is not freight at all, it is paper and it is prototypes. Original executed agreements, closing sets, apostilled corporate documents and litigation bundles cross this lane constantly on deadlines set by lawyers and courts rather than by logistics, and a scan will not do because the original is what has legal effect.
The second driver is industrial and concentrated in a few places. Aerospace suppliers in the Midlands and the Southwest, offshore energy equipment through Aberdeen, and pharmaceutical and diagnostic material moving between the Cambridge, Oxford and London clusters and their American counterparts. In each case the item is small, the consequence of its absence is large, and the cost of waiting is counted per hour.
Brexit changed the operational picture more than the commercial one. The UK is outside the EU customs union and single market, which means a consignment for London is a separate import from a consignment for Frankfurt even when both leave New York on the same evening. That is not a difficulty so much as a decision to be taken at quotation rather than discovered at Heathrow.


