Andy Turner and Dave MacLeod spent 10 hours to climb to the top of the highest vertical sea cliff in the UK – St John’s Head at the Island of Hoy in Orkney, Scotland, that reaches 1,128 feet (335m). Andy Turner and Dave MacLeod spent 10 hours to climb to the top of the highest vertical sea cliff in the UK – St John’s Head at the Island of Hoy in Orkney, Scotland, that reaches 1,128 feet (335m). Source