Britain allowed the export to Iran of a cargo of radioactive material that experts believe could be used by Tehran in a nuclear weapons programme, a media report claimed. On August 31, a truck carrying 1,000 kg of zirconium silicate supplied by a British firm was stopped by Bulgarian customs at the Turkish border on its way to Tehran, after travelling 2,400 km from Britain, through Germany and Romania, without being stopped, the report said, adding zirconium could be used as a component of a nuclear programme.