Currently going through a house purchase that is almost complete. As it stands, my rate will be fixed till December 2013 at 4.19%. The non fixed rate at the moment is 4.49%. With my amount of finance, the difference at the above rates is £13 between fixed and variable. The bank sent me a letter yesterday offering me the chance to fix my rate till March 2015, so an extra 15 months. There will be an extra fee of £100 to pay though. So by my calculations, it will save me at least £95 over that term once you take the £100 fee out. Still need to call my account manager at the bank to make sure I understand it correct but that seems to be the gist of it. I am not all that savvy with interest rates and whatnot but from what I can see, I don't have much to lose. Can't see interest rates going any lower as the base rate is already at 0.5%. Then if the interest rates do go up in the next 2 years then I only stand to gain as I will still have a fixed rate. So, is this worth doing?