Brexit means Brexit.” As circular as it is concise, this three-word sentence tells us much about the style of Theresa May, the UK prime minister. I take this to mean that the UK will, in her view, formally leave the EU, without the option of a second referendum or a parliamentary override. If so, it seems overwhelmingly likely that the outcome will be “hard Brexit”.

By “hard Brexit” I mean a departure not only from the EU but also from the customs union and the single market. The UK should, however, end up with a free-trade arrangement that covers goods and possibly some parts of services and, one hopes, liberal travel arrangements. But the “passporting” of UK-based financial institutions would end and London would cease to be the EU’s unrivalled financial capital. The UK and the EU would also impose controls on their nationals’ ability to work in one another’s economies.

This is not the outcome many desire. As the Japanese government has made brutally clear, many Japanese businesses invested in the UK in the justified belief that the latter would provide a stable base for trade with the rest of the EU on terms as favourable as those available to producers anywhere else. These businesses are understandably worried about their prospects. The same applies to many others whose plans were made on the assumption that the UK had a settled policy of staying inside the EU.