Coolmore boss John Magnier and his family have launched High Court proceedings over the sale of Barne Estate, a 751ac residential tillage farm close to Clonmel, Co Tipperary. John Magnier, his son, John Paul, and daughter, Kate Wachman, filed a plenary summons on Monday against Richard Thomson Moore, Barne Estate Ltd, and two Jersey-registered companies, IQ EQ One and IQ EQ Two.