Ride London 100

Very familiar (for my requirements).

2 x 1000ml bottles (since I don't want to stop, 800ml if cooler weather), 8% Go, = ~40g CHO per hour

1 Go gel or 1 Go bar (small) per hour, but I'd carry a bit more in case I was struggling. = up to 40g CHO per hour

Breakfast would be normal if I had time or a large Go bar if I did not.

Basically if you swapped those Nuuns for carb drink you'd have been sorted.

That makes me feel a bit silly.