The defenestration of NAB is to be an internal affair, for now.Cerberus Global Investors will buy a £625 million parcel of "largely non-performing loans" from the bank's UK Commercial Real Estate (CRE) portfolio.This is only one leg of the stinking Clydesdale carcass NAB controls in Britain, a brand too toxic, it seems, for any marginal banking roll up.The sale reduces the gross loans balance of the NAB UK CRE portfolio by one fifth to £2.38 billion as at June 2014, NAB said. This reduces gross impaired loans by 48 per cent, it said. "The transaction will result in a small gain above net book value and will release an estimated £127 million of capital for the NAB Group when the transaction is settled," the bank said. "The loans included in the sale are either in default, passed maturity or near maturity.   "Following the transaction, provisions are inclusive of partial write-offs coverage on impaired assets for the residual NAB UK CRE portfolio. They will increase from 51 per cent to 60 per cent," the bank said. "Total collective provisions to gross loans for the residual portfolio will increase from 5.5 per cent to 6.3 per cent."