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With the EU poised to ban oil imports from Iran, Allan Urry assesses the impact of international sanctions on Britain and Europe. Designed to curb Iran's nuclear programme, the oil embargo could further push up the cost of fuel. Iranian companies are involved in a number of joint ventures that bring energy into European homes and factories: File on 4 examines what will happen to these vital projects as the new round of trade restrictions begins to bite. And British companies that trade legitimately with Iran are already finding it harder to do business. They warn that it could lead to job losses. How will the sanctions affect Europe at a time when many economies are in recession or are just stagnating? And how effective are the new restrictions likely to be given Iran's experience of finding ways around international controls on what it can buy and sell. Producer: David Lewis.