PANface Right, we can see a successful IOG slot from 8AM - 11AM.
Which next slot do you mean?
You seem to be getting really wide IOG slots assigned from Octopus, as per your activity log in WW:
Saturday at 18:30, you had an 18:28 - 11:00 mapped slot: Charge instruction set for IOG 18:28 - 11:00: 100% target at charge rate of 100%
Similar thing happened Sunday afternoon: Charge instruction set for IOG 16:28 - 11:00: 100% target at charge rate of 100%
In summary, I'm not sure I understand your question/problem. Octopus creates the mapped charges and will change this at the drop of a hat. We just react to this and condense the relevant schedules and issue charge instructions.
So based on the instructions as seen from the activity log above, your defautl 23:30-5:30 was well covered by both the 18:28 - 11:00 instruction as well as the 16:28-11:00 instruction.