Frank Dunlop's lies to the Mahon Tribunal

Frank Dunlop's evidence has been the cornerstone of the Planning Tribunal's proceedings now for several years but it is now evident that he has continued to lie to the Tribunal long after is infamous “confession” to the former chairman, Feargus Flood and his recent story of having bought part of a racehorse in 1992 for £20,000 is clearly literally incredible. Given that his credibility is not close to rock-bottom, the issue arises, what plausibility can the Tribunal attribute to any of his allegations about councillors being bribed?