In January 2016 the US Office of Foreign Assets Control adopted an important exemption for US companies in the context of the liberalisation of sanctions with Iran.
GCO Blog
The EU has adopted the legislation needed in order to complete a substantial round of relaxation of sanctions in relation to Iran.
The UK Government has imposed additional sanctions against Iran. National measures were adopted under Schedule 7 to the Counter-Terrorism Act 2008 and entered into force at 3 pm on 21 November 2011.