Its 3.79% fixed over 2yrs (suppose it would be less the longer term youre fixed in for) and 3.17% tracker but I suspect once this is all done and dusted the rates will hike as well.I'm currently standard rate of 4.23% (loyalty discount from 4.79%).
Ive a feeling tracker is not the best bet at the moment.
I would fix it if it was me as then I would know where I was at least for the next two years. The fixed rate is lower than your current rate so you will make a saving. Just depends on the size of your mortgage and how much you would save if you went for the lower tracker and took a gamble that it remained low. If you can afford to gamble then you can, if not play it safe.
(im not a financial expert though so you may want some more advice)