The Taoiseach Micheál Martin has written to Catherine Murphy, the joint leader of the Social Democrats, stating he has “little choice” but to grant the IBRC Commission yet another extension despite its “substantial” costs. The Commission has now spent six years investigating just the sale of the infrastructure company Siteserv to Denis O’Brien, costing an estimated €70 million to date when its costs and the 100 witnesses it has called are totted up. Martin’s letter reveals that the Commission has told him it has “completed, or partially completed, 75 per cent of its draft report (800-900 pages approximately) and the…