@Becka with diabetes, we are all different.
I know, that is why I asked "what would you expect" for "frames of reference" rather than "what should it be" as a "definitive answer".
Thanks to those who provided values, as they have been helpful.
I was planning on going out on my motorcycle today, so as I woke up with a 4.7 yesterday, and 4s are not unusual (though not in the last week) I only took half my insulin dose and skipped Metformin. So I was surprised to wake up with a 4.7.
Technically that is okay, but too low for comfort and I am legally required to have a snack, so I had the cola straws to act quickly, and the slice of bread (not a thick slice, double the thickness of the actual crust) to act slowly and keep it okay. As that was a meal I had never eaten before (why would that be a normal for anyone?) and without any frame of reference I was quite shocked it had risen to 13.6, but all your comments suggest that that is essentially normal.
I deliberately did not ask about type and treatment to get a cross-section of results. Particularly given I still have no actual idea what is going on with my diabetes. Bt there was a little activity in between eating and testing, going up and down stairs to prepare the bike as I needed to top up an oil and put my stuff in the top box. And I still took Dapagliflozin last night (even though I am certain it does very little, as suggested by it only lowering my HbA1c by just half a percent or 5 mmol/mol) as well as 17u insulin glargine.
But I guess the treatments were doing something as when I stopped two hours later I was just as shocked to be back down to 4.3. And yet, just two fruit pastilles (6.6g carbs) got me up to 6.2 four hours later, when a falafel sandwich (I would need to look that up) saw me 11.9 two hours later, and still 7.8 five and a half hours later. There really is no consistency with the endocrine system.
Incidentally, cola straws are fake liquorice made from wheat, cola flavoured, and covered in sugar and citric acid, and are hollow making them a sort-of straw. They are about 5g or carbs each and my preferred hypo treatment as they are sour rather than sweet, which is why I had those to hand.
I guess the answer for next time then is less fast acting and more slow acting. Many thanks for all your help putting it in context.