The French phrase l’esprit de l’escalier signifies the moment at the bottom of the staircase when you think of what you should have said as you were leaving. The Brexiteers have not yet decided what they should have said in June 2016. Photograph: Stefan Rousseau/PA Wire

Knowing how to make a grand entrance is all very well but, as the Brexit saga reminds us, the ability to make a dignified exit is even more important.(...)