Mortgage payments 'could increase by up to 14%'
Mortgage experts are warning that the cost of home loans could be about to increase.
RBS, which owns Natwest, has already put up interest rates on three products.
The Halifax, Britain's biggest lender, is expected to make a similar announcement as early as tomorrow.
It would mean its customers would face a rise of up to 14 per cent in their monthly payments.
Joe Lynam reports.