Right then, leave it to the Americans to treat an 800-year-old charter they've never actually read like a magical incantation — I've seen better legal reasoning on the back of a beer mat at the King's Head, and at least the beer mat doesn't pretend to be constitutional scholarship. My father would've had a proper fit of the vapours hearing the Magna Carta invoked to solve whatever regulatory mess they've gotten themselves into this week; he spent forty years telling clients that precedent isn't