Businessman Paddy McKillen has been given permission by the Dublin High Court to join the billionaire Barclay brothers to his long-running action against State property agency Nama.
The Belfast-born developer alleges Nama leaked sensitive financial information to his competitors during their failed bid for control of three luxury London hotels - the Connaught, Claridge's and The Berkeley. He made the ex-parte - one side only - application to include members of the Barclay family, including twins Sir David and Frederick Barclay in the Nama action.
The Barclays were unaware of the move and not in court. It is understood Mr McKillen's lawyers will serve court papers on the brothers.
Mr McKillen is also claiming that there was collusion between Nama and other State agencies which gave the UK billionaires an unfair advantage in their bid to seize control of Coroin, the holding company of the hotels.