Though you are i n the UK there IS discrimination protection known as the DDA, look at:
As was said, good fats are things like virgin olive oil (if real, many are poor fakes despite the label), and much better, coconut oil. The only thing I cook with is coconut oil, since olive oil break down with heat, and coconut oil doesn’t.
Thing is that most vegetable oils, such as canola oil, turn into tans fats when you heat them up, and trans fats are now recognized as the worst thing for your bloodstream.
Another factor that affects many people’s thinking is cholesterol, which we have all been warned about controlling for the last 50 years or so. Problem with that is that ANYTHING you’ve heard about it is wrong, from the start. Cholesterol does NOT clog the arteries causing heart attacks and strokes, this is caused by inflammation in the artery walls that blows out under stress, blocking the blood vessel. More important, fats that we eat don’t create cholesterol plague in the arteries, that is created by eating grain products, which raise blood glucose levels creating damaged red blood cells that tangle with others. These penetrate the artery walls creating a pocket full of pus and dead cells.
Fats are now starting to be looked at in standard medical practice as being the best kind of nutrition, since they last longest, which helps your situation to an extent, and cause no problems, since they don’t involve turn unto glucose and involve insulin, they become ketones, which are a much better energy source for the brain than glucose anyway.
Getting back to the original problem, it’s always best to carry glucose tabs or candy to take when a hypo starts affecting you, though liquids, such as a soda pop to drink may be absorbed faster. I’d also suggest that you stop taking a combination insulin such as Humalog 25. Thing is that it locks you into a situation that may be causing your problem. When you take the 2 kinds of insulin separately you can tighten control by adjusting whichever one is wrong for that day. With your situation you may find that very helpful, just reduce the slow insulin dose slightly to give you better endurance in the afternoon. Then if you are higher at suppertime you can take more Humalog to counteract the high that resulted.
Of course if you DO go low carb by eliminating grain products from your diet your insulin needs will go down a fair amount, and must be adjusted to fit that. The other point is that the less insulin you need to take the less variability will affect you. Ypu said you take 46 units per day, I take about 25 a day total since I low carb. See if you can find Dr Richard K Bernstein’s book “Duabetes Solution”, he explains it very clearly, understandable by anyone.