To update what happened to the Hrossey last night, it appears that the vessel suffered total engine failure halfway between Sumburgh Head and Fair Isle.
After getting the engine re-started, the bow thrusters were found to be out of action, so with the blustery weather at the time the decision was taken to head back to Lerwick.
The Hrossey's own engineers worked overnight on the problem, and she left Lerwick at 05:30Hrs bound for Aberdeen.
Regards
Richard