Boris Johnson is about to find out just how weak the UK is after Brexit | Simon Jenkins

Britain’s economic weight has diminished since leaving the EU. The government must acknowledge this in trade negotiations

Here we go again. Brexit did not end on Friday night. Formal divorce proceedings reached a messy conclusion, but the couple will cohabit for at least another 11 months. Nothing in practice has changed. No one is hurt, yet. Anything might still happen.

A helpful sign has been the hopes expressed by sensible Europeans such as the former EU president, Donald Tusk, for friendly...