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As the UK government triggers Article 50, Ritula Shah speaks to two experts on the art of negotiation. Jonathan Powell is a diplomat who was Tony Blair's Chief of Staff and was chief British negotiator on Northern Ireland. William Ury is a Senior Fellow of the Harvard Negotiation Project and author of "The power of a positive No: How to say no and still get a yes". (Photo: Theresa May signing a letter triggering article 50. Credit: Press Association)