"Brexit means Brexit!"

With those words British Prime minister Theresa May confirmed that Britain’s exit from the EU would be complete and irreversible. Also confirmed: Her place amongst the worst sloganeers in British political history.

In fairness to May, the bar for excellence in British political soundbites is set stratospherically high. This, after all, is the country that rallied the world with "We Shall Fight on the Beaches," then chilled it with "Big Brother is watching you." The birthplace of Churchill and Orwell, of Shakespeare and Wordsworth, and of Billy Bragg...