That'd be my guess also: https://britishlistedbuildings.co.uk/300017169-thorne-i...

		defrost 4 months ago \| parent \| context \| favorite \| on: Private Welsh island with 19th century fort goes o... That'd be my guess also: https://britishlistedbuildings.co.uk/300017169-thorne-island... The British Listed Buildings site has photos of the fort and boat approach with stairs, picking crane, and sloped ladder lift for getting loads from water to gate.