Hi Magski!
Fruit is high in sugar and needs to be eaten in small portions for many of us. Most of us seem to tolerate berries (strawberries, raspberries, blackberries etc) better than any other fruit. Some of us (myself included) tolerate a small apple reasonable well, but banana is the carb king of fruit and most of us cannot eat more than a small piece of banana without our blood glucose going high. I would certainly never eat a banana and apple at the same time.
I don't know much about novomix insulin, but my understanding of it is that you take a dose twice a day and then you eat an appropriate amount of carb at the appropriate time to work with the insulin. Your apple and banana was just too much by the look of it. Next time, try just the apple and test your BG before and two hours after eating to see what effect it has.
Most of us find that we have to reduce our carb intake to control our diabetes (not just sugar, but starch carbs as well e.g. potato, bread, rice, pasta, cereal). If you do start reducing your carb intake, you should get proper advice, because your Novomix might need the dose adjusting to match a lower level of carb. Hopefully someone more familiar with that insulin will be along soon to offer better help.
Smidge