ElBaradei was later delivering the annual Alastair Buchan Memorial Lecture at the International Institute for Strategic Studies, named after the 47-year old think-tank's first director.
Other lecturers in previous years have been presented by former US Secretary of State Henry Kissinger and former British Foreign Secretaries Lord Carrington and Lord Hurd among others.
Foreign Secretary Jack Straw held talks Tuesday with director general of the International Atomic Energy Agency (IAEA) Mohamed ElBaradei during his visit to London to deliver a speech on 'Reflections on Nuclear Challenges Today.'
The meeting, which was expected to include discussions on Iran's nuclear program, was low-key without any subsequent press conference.
The Foreign Office also said that it would be making no statement about the talks.
ElBaradei was later delivering the annual Alastair Buchan Memorial Lecture at the International Institute for Strategic Studies, named after the 47-year old think-tank's first director.
Other lecturers in previous years have been presented by former US Secretary of State Henry Kissinger and former British Foreign Secretaries Lord Carrington and Lord Hurd among others.
The IAEA chief's visit comes amid optimism about the restart of EU negotiations with Iran to reach long-term arrangements on its nuclear program following Britain, France and Germany offering to resume the deadlocked talks.
In an interview with the Independent newspaper on Monday, ElBaradei, warned against the dangerous game of brinkmanship in the west's nuclear dispute with Iran.
"Everybody would hurt," he said. "You would then open a Pandora's box. There would be efforts to isolate Iran; Iran would retaliate," he told the daily.
On Saturday, the IAEA director general is due to go to Oslo to receive this year's Nobel Peace Prize awarded to him and his UN watchdog agency.
