The global trade and transportation of oil has for many decades been at the forefront of Middle Eastern brinkmanship as has control of the sea lanes that this valuable resource travels along. In July 2019 the UK became embroiled in a political standoff with Iran when Royal Marines were sent to board and take control of a supertanker called Grace 1 as she sailed past the British overseas territory of Gibraltar. The UK had information that she was full of Iranian oil and was headed to Syria in breach of international sanctions. Tom Bateman, producer Zeynep Edim and myself travelled to Gibraltar to cover the story.