Sotheby’s is marketing the Hebridean island, Shuna, which spans 1,110 acres and includes a farmhouse as well as Shuna Castle.

The castle, now in disrepair, was built in the early 20th century and designed by an architect who sought to build more in America – but the blueprints sank with the Titanic.

Jim Gully, whose family owns the island, told the BBC that the ship’s famous sinking “stopped lots of flat-roofed castles being built in America”.