The High Court has dismissed billionaire businessman John Magnier’s claim that a legally binding handshake agreement was made with the trustees of the Barne Estate to buy the 751-acre estate in Co Tipperary in the long-running, multi-million-euro legal saga.  The bloodstock magnate claimed that the Thomson-Moores, the hereditary heirs and beneficial owners of the estate, agreed to the sale of the property when they shook hands on a €15 million agreement at his home in Coolmore on the evening of August 22, 2023. He brought the lawsuit, with his son JP and his daughter Katherine Wachman, to try to enforce…