I never bothered to estimate or record how much saturated fat I eat - you need to eat enough to make up for the carbs you take out. It also helps you feel fuller longer. There is (to say the least) debate about the levels of saturated/unsaturated fat in the diet but that is not related to blood glucose. I am in favour of natural (saturated) fats.
For carbs the confusion comes from the American systems of reporting carbs and fiber together and then removing the fiber. They often call this "net carbs".
In the UK fibre doesn't get included, so the carb figure given is the one you use. The spelling is usually a giveaway- fiber/fibre tells you (usually) if it's a UK source or not.
Food manufacturers have a number of ways to fudge the carb issue on labels, so you need to be careful. My preferred solution is to buy as little of anything that comes in a packet/jar/box as possible.