David Cameron becomes first British leader to speak to Iran in a decade Britain has not had a diplomatic presence in Iran since November 2011, when its embassy in Tehran was stormed. That incident triggered one of the worst crises between the two countries since the 1979 Islamic revolution. Britain has now appointed a non-resident Charge d'Affaires to Iran in a sign of improved relations with Tehran. A Downing Street spokesman said: "The two leaders discussed the bilateral relationship between Britain and Iran welcoming the steps taken since President Rouhani took office, including the appointment of non-resident Charges d'Affaires last week. They agreed to continue efforts to improve the relationship on a step by step and reciprocal basis. Further talks on Iran's nuclear programme are due to get underway in Geneva today [WEDS]. "The Prime Minister underlined the necessity of Iran comprehensively addressing the concerns of the international community about their nuclear programme, including the need for greater transparency," the spokesman said. President Rouhani tweeted about the talks and said the pair emphasised "ways to create positive atmosphere to address concerns of both sides on the nuclear issue."