Because you are charged an interest rate on your mortgage, you will end up paying back more than you borrow, so the less time you spend paying it off, the less you will pay in total. But the shorter your term, the more your monthly payments will be.
Repayment
Pay off some of the interest on your mortgage, plus the original loan amount, every month. Once your payments have finished, the whole mortgage is paid off.
Interest only
Only pay off the interest on your mortgage each month. You'll need to make other arrangements to pay off the original loan amount that you borrowed,
such as a savings or investment plan. (This option is not available for first time buyers. You must have up to a maximum 75% LTV).
Part and part
A combination of the repayment and interest only. With this mortgage, when your payments finish you'll still need to pay off the remainder of the
original loan amount. You will need to make arrangements to pay off this element of the loan,such as a savings or investment plan. (This option
is not available for first time buyers. You must have up to a maximum 85% LTV).