Manchester Building Society is headed to the Supreme Court after it was given permission to appeal a decision in its case against auditor Grant Thornton. The long-running case dates to 2013, when the building society had issues over hedge accounting and was forced to shore up its finances with an emergency £18m capital injection in 2013. It then launched a £49m negligence claim against former auditors Grant Thornton over its advice in relation to hedge accounting in early 2015.