Iran’s former top security official has said the United Nations watchdog investigating Tehran’s nuclear plans now has all the information it needs to establish that the programme is of a peaceful nature.

Ali Larijani was one of the architects of the so-called “work plan” agreed with the International Atomic Energy Agency in August. It was designed to answer all outstanding questions about Iran’s covert nuclear programme dating from the 1980s but was opposed by those, including the US, who saw it as a diversion from attempts to stop Iran’s uranium enrichment.