Unlike in the United States, where the Constitution was written down by the Founding Fathers nearly 250 years ago and is regarded as sacrosanct by many Americans, the British Constitution has never been formally inscribed but instead has evolved over centuries. The Supreme Court in Parliament Square can only decide if the government has acted within the law as it stands and cannot decide what that law should be. The Court does not have the power to overrule the politicians who sit in the Palace of Westminster opposite. Parliament always has the ultimate authority under the British system.

There's a revolution happening in London. But it's not a political one, or even a social one. Far away from the headline-dominating machinations of governmental Westminster and the bright lights of the glitzy west end theatres, an artistic revolution has been gathering pace in the East End of the city. Into this atmospheric, edgy neighbourhood come the artists, often incognito, to adorn the walls with their creative, talented, sometimes controversial works.