David Cameron has spoken of the need to reform UK human rights to “safeguard” the Magna Carta’s legacy as the historic document’s influence over the past 800 years was celebrated. The Prime Minister’s words came at a major international event, attended by the Queen and an audience of thousands, marking the groundbreaking accord’s role in helping to define concepts such as the rule of law and equal rights for all. On the site at Runnymede where King John, on June 15 1215, accepted the historic document that limited the power of the Crown, Mr Cameron said it remains “sewn into the fabric of our nation, so deep we barely even question it” but complained that the notion of human rights in Britain has been “distorted and devalued”.