If Marine Le Pen wins France's presidential elections in May, all talk of punishing Britain for the outrage of Brexit will become irrelevant.

French diplomacy will pirouette overnight under a National Front (FN) leader. The Élysée Palace will seek an Entente Cordiale with the British, offering a bilateral alliance on new foundations.

It will then be the European Union that faces an existential choice: whether to reinvent itself as a loose federation of nation states, or succumb to galloping disintegration

"What is the point in punishing a country? It is senseless, unless you think the EU is a prison, and you are condemned if you escape. I want to rebuild our damaged relations with the United Kingdom," she told the Daily Telegraph.

"A people decides its own destiny. You cannot force a country to do something that is against its own interests, or against the democratic process," she said.