The deal is being offered through master issuer Silverstone.
The bid for more mortgage cash came as Nationwide’s confidence survey showed sentiment towards spending on household goods was little changed in February, dropping by one point, although the index currently sits 23 points higher than this time last year.
Reservations about making major purchases remain, with less than a quarter considering this to be a good time for such purchases, reflecting a difficult labour market and the protracted squeeze on disposable incomes
Robert Gardner, chief economist of Nationwide, said: “After showing signs of cautious optimism at the start of the year, consumer confidence slipped back in February.
“The decline was fairly broad-based with an increase in the proportion of consumers describing current economic conditions as bad, and a rise in those reporting unfavourable conditions in the labour market.
“Consumers also scaled back their expectations for the future, with the forward-looking aspects of the index weakening during the month.
“Even though interest rates remain at historic lows and the Bank of England opted to inject another £50bn into the financial system in early February, weak labour market conditions combined with weaker than expected economic growth are continuing to weigh on confidence.”