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CalMac chief executive Duncan Mackison said staff had worked hard to complete sea trials and crew familiarisation for the first gas-powered ferry built in the UK.

West coast ferry operator CalMac will then need to conduct its own sea trials so the ship, destined for the Arran route, is unlikely to be carrying passengers until August or September.

MV Glen Sannox is making a short journey downriver as it begins sea trials ahead of delivery this summer.

Ferguson Marine said the start of sea trials was a significant milestone.

During initial sea trials Glen Sannox will gather pace, slow down and test its anchors, possibly travelling as far as Gourock over the coming days.