FERRY users on Orkney face a further wait for services until a vital part needed to repair a crippled vessel arrives in Scotland tomorrow.

Serco NorthLink Ferries says it will be another two-and-a-half weeks before the MV Hamnavoe, which sails between Scrabster in Caithness and Stromness in Orkney, is back in action.

It has been out of action for the past 10 days, causing inconvenience for residents and hauliers.

The service is heavily subsidised by the Scottish Government and provides 60% of the car-carrying capacity on the Pentland Firth.

Its difficulties follow the crankshaft in its starboard engine suffering an irreparable breakdown. The Hamnavoe limped down to the Firth of Forth on its port engine at the end of last week to await a replacement crankshaft arriving from Germany.

Stuart Garrett, managing director of Serco NorthLink Ferries, said: "The MV Hamnavoe is currently docked in a wet basin at Rosyth Dockyard, where all preparatory work is progressing according to plan while we await the delivery of the new crankshaft, scheduled to arrive on Tuesday May 7."

However, replacing the crankshaft is a huge engineering undertaking and the company has conceded it is not likely to be back in the Pentland Firth before Saturday May 25.

Mr Garrett stressed the company was still trying to make alternative arrangements.

"We are continuing in our efforts to look for a suitable replacement ferry while the MV Hamnavoe is being repaired. NorthLink has also added a freight crossing from MV Helliar that is running a twice-daily freight service between Scrabster and Stromness to ensure businesses can continue to move goods between Orkney and Caithness."

While the freight service can take cars, it is permitted to carry only 12 passengers/drivers so it is used primarily by hauliers transporting their lorries to and from Orkney.