I'm going to wait. If I paid out my loans in the first 4 years I was up for extra fees and that time is up in 7 weeks and contemplating developing so better to hold off from fixing for now in case I want to shop around.
My N@b manager is my best friend in disguise, whenever I've cracked and tried to fix interest rates in the past 18 months paperwork and emails have gone missing. No complaints from me.