The best thing for you to do is find a good Independent Financial Adviser that is FSA registered, this will obviously cost money if you take out a policy through them, but personally I think it is well worth it. Our mortgage over 18 years for 100,000 is about �600 but we are on a reduced rate variable mortgage, which means although we pay below the interest base rate of 5.25%, as the interest rate changes so does our repayment, With the uncertainty over interest rate rises in the near future I would now personally go for a fixed rate mortgage as they are usually around the base rate mark and stay that way for a set period of time. Like I said this is just my personal view and would recommend an Independant Adviser any day rather than just go to a bank/building society.