If the name of UK property developer Henry Gwyn-Jones sounds familiar, it is probably because he owns Ballynatray House, a Georgian mansion on the banks of the Blackwater in Youghal, Co Cork. The 57-year-old, who describes himself on LinkedIn as “a self-taught, highly motivated, independent businessman”, has poured money into his country pile, and the exclusive estate with guest accommodation is currently valued at €26 million, a good mark up from the €12 million he paid for it in 2004. Otherwise, Gwyn-Jones’ interests are centred outside of Ireland, mostly in Britain and for several years in Eastern Europe where he…