His positions as preferred adviser to business people active both in the United Kingdom and Iran has enabled Lamont to develop contacts at the highest level in Tehran. These include: Mohammed Seyed Hossein Adeli, chairman of the Gas Exporting Countries Forum (GECF), Mohammad Nahavandian, head of the private office of President Hassan Rohani, and the influential chairman of the Iranian-British Chamber of Commerce (IBCCIM), Ali Naghi Seyed Khamoushi. Above all, however, Lamont has become the Islamic Republic's main advocate among Western governments, seizing every opportunity possible alongside Tony Blair's former foreign minister, Jack Straw, to support the lifting of economic sanctions.

As a high visibility personality already linked with an Iranian businessman, he was the obvious choice to take over the vacant chairmanship of the British-Iranian Chamber of Commerce (BICC) in 2004 and thus become a key advocate of the return of British companies to Iran. So as to be able to obtain contracts as soon as sanctions were lifted in mid-January, Lamont and his associates prepared the ground, encouraging the BICC to send companies to Iran and supporting the rise to prominence of young lawyer and Iran specialist Nigel Kushner, who is close to Lamont. Proof of his legitimacy on business in Iran, Prime minister David Cameron appointed Norman Lamont as UK's trade envoy to the Islamic Republic in January 2016.