The UK is putting on display the four remaining copies of a document that helped lay the foundation for the rule of law and democracy. br br This year marks the 800th anniversary of the 'Magna Carta' - an agreement signed between England's King John and rebellious barons in 1215. br br The document was used by the Founding Fathers in the US as a basis for the country’s constitution.br br Al Jazeera's Simon McGregor-Wood reports from Runymede in southern England.