If you have savings, some lenders allow you reduce the total amount of interest you pay by offsetting your savings against the loan. These are called off set mortgages. For example, if your mortgage is £100,000 and you have £2000 in savings, you only pay interest on £98,000.
For interest only the total amount payable will depend on the savings plan you choose
For the total amount payable on the offset capital capital repayment you must entersavings amount in the above 'Savings balance (£)' field.