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That comes after the UK government admitted plans for the Rosebank oil field off Shetland had been approved unlawfully after the decision was challenged in court by environmental campaigners.

He also refused to state his personal position on the Rosebank oil field, another project he has previously opposed for environmental reasons.

Mr Opedal told the BBC he was confident that Rosebank - a giant new oil field in the North Sea - would go ahead, despite a recent court ruling that consent had been awarded unlawfully.

The controversial Rosebank oil field is thought to hold 500 million barrels of oil.

The law “represents an illegal attempt to coerce an individual company to stop operation of its legal business,” oil field owners say in their lawsuit.