At least five vessels have been contracted for passenger transport duties, with rates for both platform supply vessels and anchor handlers moving up today.

All Super Puma helicopters, believed to account for half the passenger traffic to North Sea oil installations have been grounded so surface transport is the only real alternative.

Rates for vessels to transport workers to and from the offshore oil fields rose to as high as £70,000 daily, more than twice the pre-tragedy level.

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