The Guardian | Patrick Wintour: The morning after a group of 30 Royal Marines helped seize the Iranian-flagged Grace 1 in Gibraltar, tired Foreign Office officials did not look exactly jubilant. There was not exactly a sense of foreboding, but diplomats were aware of the wider bilateral consequences for British-Iranian relations.

Now, with the capture of a British-owned oil tanker in the Persian Gulf, some of their worst fears have been realised. The Stena Impero and its crew of more than 20 are now in the hands of the Iranian Revolutionary Guards – and the UK has been shown to be unable to protect British shipping going through the waterways of the strait of Hormuz.

The British insist that they only impounded Grace 1 due its suspected destination – a port in Syria – not due to the fact that the ship was carrying Iranian oil. European Union sanctions against the regime of Bashir al Assad regime were there to be enforced and international law upheld, the British argued. There seemed little doubt, given its circuitous route, that the ship was bound for Syria.

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