UK exporters have lost trade with the European Union because the UK no longer tests and certifies products the way the EU does. That is the finding of a report covered by the Chartered Institute of Export and International Trade, and it matters well beyond Britain. It is a rare piece of evidence that conformity assessment, the process of proving a product meets a market's standards, shows up in the sales line rather than only in the compliance budget.

Conformity assessment is the unglamorous machinery behind market access. Before a product can be sold in a given market, somebody has to establish that it meets that market's safety, performance and labelling requirements, and there has to be paperwork proving it. When two markets recognise each other's testing, one set of work covers both. When they stop recognising each other, the work doubles.

That is what has happened between Britain and the EU. The two ran a single testing regime before Brexit. They now run separate ones, and the divergence has widened rather than settled. The report's conclusion is that the gap has cost UK exporters European business.

If you are a US brand, the temptation is to file this under British politics and move on. Do not. The useful lesson has nothing to do with Brexit and everything to do with how you draw the map of Europe.

• The UK and the EU are two regulatory markets, not one, and a test certificate that satisfies one does not automatically satisfy the other
• Treating them as a single territory in your launch plan builds a delay into it, because the second approval route is discovered late rather than scheduled early
• Divergence tends to grow, so a product cleared for both markets at launch may need rework when one side updates its standards and the other does not

The practical consequence is a sequencing decision. Brands that plan UK and EU entry together can run both approval routes in parallel, share the underlying technical file and testing work where the requirements still overlap, and absorb the extra cost once. Brands that launch in one market and bolt the other on afterwards usually pay twice and wait longer, because the second route starts from a standing stop.

There is a commercial reading too. European buyers, whether consumers or retail partners, do not see your conformity paperwork. They see whether the product is available, whether it arrives, and whether it carries the marks and the information their market expects. A standards gap is invisible right up to the point where it becomes a lost order.

Expandly maps product compliance for the UK and the EU at the same time, before listings go live, precisely because the two regimes have stopped moving in step.