Pantry moths are a real problem out here and there are certain things they just love in the grub stage. Dried fruit and bran are among the worst so Sultana Bran is a paradise for grubs.
Not sure if you can get them over there but I use a pantry moth trap which is a piece of cardboard that you fold into a triangular prism shape, open each end. The inside is lined with a bait infused sticky gel. After a few week in the pantry it is basically full when the infestation is bad. I regularly need to go through and locate the source of infestation and toss it out.
I have recently been going through all of my herbs and spices, grains, flours and legumes and transferring them to O-ring sealed Clip-it containers. I have found bugs inside them so they must come inside the original packaging.