(Corrects source in headline) LONDON, Oct 29 (Reuters) - British banks and building societies granted 72,645 new mortgages for house purchase in September, the lowest number since July 2020, Bank of England data showed on Friday - though more than economists had expected. Net consumer credit expanded by 231 million pounds ($318 million) in September, around half economists’ average forecasts in a Reuters poll for a 450 million-pound increase and the smallest rise since July. ($1 = 0.7256 pounds) (Reporting by David Milliken Editing by William Schomberg)