@Olivier5,
It is indeed an amusing cartoon. However there is no such "jungle" of escaping British in Calais, and this is as much a depiction of Continental European resentment of the impending divorce, as it is of the ongoing political tumult in the UK .
While large numbers of UK citizens are indeed adversely affected by the Brexit transition, I'm not aware of any current mass movement of British citizens to reverse the public decision made in the referendum a few years ago. Indeed this is, at least in my perception, the most significant element of the ongoing drama. It's the dog that didn't bark.
Meanwhile the EU Economic leadership is meeting with their Japanese counterparts, perhaps to discuss the ongoing "Japanification" or stagnation of Europe.