@Julian_Hands , following the discussion in your thread about cycling, I think you need to do two things. The first is that you need to basal test:
https://mysugr.com/basal-rate-testing/ Given what you are seeing, I think you may have your basal level set incorrectly, and this might help you find out where it is at. This may help with understanding why getting your food and exercise levels right is proving hard.
Secondly, I've just looked at the timing of your doses. You say:
woken this morning at 5:40hrs with a glood glucose of 3.2mmol/L.
I've cycled in again today and reduced my NovoRapid (short acting) by 4 units, then ate my cereal (All Bran (75g) and Semi Skimmed milk(250ml) 46g carb in total, This allowed me toleave the house at 6:25hrs with a blood glucose of 6.0mmol/L but after getting to the top of the climbs on my ride, at the halfway point 15km in, I tested my sugar and had a reading of 2.8mmol/L, therefore eat a bit of homemade flapjack to give a boost and got to work with a BG of 5.1mmol/L at 7:45hrs. (perfect)
I've now seen a trend over the last 5 days, gained by closely monitoring my BG sugars with an average of 15 tests a day and to see the effects of the cycling, but really baffled by a definite trend i'm now seeing. My BG levels have spiked consistently an hour after I've got to work and today at 8:45hrs my sugar again rose 11.4mmol/L?
I've attached a picture of what you've described. It's quite interesting. YOur Novorpaid seems to be kicking in between 6.25 and 7am and sinking you fast. Are you injecting this into your legs at all, as that would accelerate the use and potentially cause problems. I suspect that, while the all-bran does contain about 15g of sugar, it also contains about 30 of other carbs that can take some time to release due to the high levels of fibre. I think what you may see happening is the sugars from the all-bran kicking in soon after eating, then your novorapid kicking in whilst on your way up that hill but the remainder of the all-bran carbs becoming available a little later. When you eat the flapjack at the halfway point, not only are you replenishing missing glucose, but you are also adding to the additional release from the all-bran. This will be on top of your liver reacting to the hypo while cycling, causing the following spike, which is pretty typical of a hypo induced liver dump.
I think you're going to need a bit of trial and error on this one. I suspect that the insulin immediately before cycling is not helping, but also the breakfast you are eating is adding to the complicated picture. Have you tried doing this without breakfast and seeing what the results are? I suspect that will be better.