I fixed for 5 years, 4 years ago. About 3 months after doing it, thanks to the so called expert "mortgage advisor", interest rates dropped rapidly. He got his nice commission, and I got seen off! I'd go for two years personally. What does the extra percentage in rates translate to overall? Is your mortgage likely to rise by an extra £20 or £30 pcm if rates rise a little? I don't think they will over that period for you to see any benefit by taking them. I was on a tracker previously, and the range was only about £30 over the 5 years I had that. (Admittedly it was only a 75k mortgage at the time though). Its a gamble whatever you do, but do what you feel is right for you, and don't always take the "experts" advice as gospel.