Aberdeen-based North Star Renewables is following up its debut $376m wind farm ship order with another deal for 'daughter craft' to transfer crew.

The two multi-million dollar units will be confirmed in September at a UK shipyard.

Delivery will be in 2022 and 2023 for operation at Dogger Bank Wind Farm off the UK.

Designed by UK company Chartwell Marine, North Star said they will be the world's first hybrid vessels of this kind.