Brittany Ferries has chartered two of Stena Line's six under construction Ro-Pax ferries.
Stena Line has six vessels currently being built at AVIC Weihai Shipyard, with three being used on their Irish Sea routes and the remaining three being chartered out to external parties.
Brittany Ferries will use the two vessels to serve its long-haul UK to Spain routes.
The 215-metre-long, 42,400 tonne vessels are expected for delivery in 2021 and 2022.