I would not fix because I would not consider the likely premium charged over and above a tracker to be worth the peace of mind of fixed repayments especially if I would be able to deal with a rise in the tracker rate. In addition fixed rates are not flexible and if I happened to come into a bit of money and wanted to reduce or clear my mortgage early to save on interest charges or break the fixed rate period for some other reason (e.g. moving to another lender, moving house/mortgage etc.) then I would have to pay penalties. You are still missing the point - you are unlikely to second guess the institutions, time the market and save money by fixing (quite likely the opposite in fact) so you need to weigh up the other pros and cons when deciding what to do.