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All sanctions relating to Iran's nuclear programme have been lifted in a deal that has been labelled historic. Iran's president Hassan Rouhani said a 'golden page' in the country's history had begun. The former British foreign secretary Jack Straw has been a long-time supporter of closer ties with Iran and has visited the country many times. What is his response to critics who believe the rapprochement will bolster the hardliners in Iran, exacerbate regional rivalries, and fuel terror and instability in the Middle East?