The year 2015 witnessed celebrations around the world of an event that took place 800 years earlier in a meadow west of the city of London near what is now Heathrow Airport. Then, the main participants were King John on the one side, and leading barons and prelates on the other. They had gathered to sign up formally to a document (which came to be known as Magna Carta) with the aim of forestalling violent rebellion against the monarchy. Eight centuries later, four provisions of the 1297 re-issue of Magna Carta still decorate the United Kingdom’s statute book even though the document was not a ‘statute’ (or, for that matter, a ‘law’) in the modern sense and the surviving provisions are of no practical significance.