For anyone curious, there appears to be an almost 1p difference in supplier savings rates.
6.30p/kWh with COOP and Octopus
6.50p/kWh with EON Next
7.20p/kWh with Good Energy
A pretty sizeable difference between suppliers, and I'm unclear why that's the case.
At the start I assumed ripple would sell for X, take off overheads, and give us the differences. I appreciated a while back this wasn't actually the case, but the way this is all negotiated and the large differences seems very odd.