By Jon Robinson The £2.5bn mega-merger of housebuilders Barratt and Redrow looks set to be finally given approval by the Competition and Markets Authority (CMA). The watchdog launched an investigation into the proposed deal in June after it was first announced in February. Earlier this month, the CMA said that the deal hinged on the sale of just 10 houses. Now, the watchdog has said it considers that there are reasonable grounds for believing that the deal will be approved after a series of compromises were put forward by Barratt and Redrow. The CMA has until 18 October to decide whether to ac…