Keir Starmer wants to sign a new agreement with the EU — one which would smooth disruption to trade, solve the Northern Ireland border issue, and make life simpler for farmers, all in one go.

But there’s a catch.

EU officials have told POLITICO that Brussels would be interested in such a deal — known as a sanitary and phytosanitary (SPS) agreement — only if London was willing to accept European Court of Justice (ECJ) oversight.

“There is no doubt in our mind” that ECJ oversight would be a “prerequisite” for such an agreement, said a senior EU official, who was granted anonymity to discuss the matter.