Britons who combine their mortgage and finances through an offset product could save a considerable amount of both time and money, according to a new report. Nearly a third of homeowners have their mortgages, savings and current accounts with the same institution, Yorkshire Bank's study showed, but make the crucial mistake of not converting them into an offset mortgage. It estimated that the typical homeowner could save over £11,600 and reduce their mortgage duration by over a year through offsetting, while the nation's borrowers as a whole could reduce their outgoings by £29 billion