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All sanctions relating to Iran's nuclear programme have been lifted in a deal that's 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's his response to critics who believe the rapprochement will bolster the hard-liners in Iran, exacerbate regional rivalries, and fuel terror and instability in the Middle East?