Hi Harry,
I'm Dan, 23, Lantus/NovoRapid but hoping to start pumping soon.
It sounds like your initial stint goes ok, then you start to plunge a bit as your body is using up more of it's reserves? Although, you've already come down from 7.7 to 5.6 having had that Orangina, so maybe more carbs required after work?
Perhaps you need to have more carbs after a certain point in your exercise too:- perhaps after an hour?
These are going to be ideas for you to think about more than exact suggestions as I'm not sure how
So, your plan might look something like:
1 - make pre-exercise insulin adjustments (I'm not pumping and you know what works for you)
2 - eat pre-exercise carbs (perhaps here it would be good to get something more starchy if it's going to be a long ride? flapjack & gluco?)
3 - have 10g sugary carbs (glucotabs or jellybabies etc) every 15-20min for hour 1
4 - have 15g for hours 2 onwards, providing exercise level is maintained
Looking back, it's clear that although you've eaten each time, your levels were still dropping:
7.7 - 59g
5.6 - 35g
5.0 - 30g
3.5 - 38g
And perhaps this is where the adrenaline has kicked in? I saw you mention in another post you sometimes find you are actually higher after exercise?
10.0 - 1.5u
Hope this generates some ideas for you anyway