From the volume of complaints on these boards, it appears that Ecotricity is pretty much at the bottom.
Maybe. Anecdotal reports are a start but not enough to make an accurate table of reliability. We know that EH chargers fail sometimes, but not much more than that.
We could have selective reporting. Perhaps SpeakEV members are more likely to post about EH failures than a fail on another network, like Polar or Source London.
Location is important. For example, I don't think we have that many active members using Source London.
There is also a reporting bias. People complain when a charger doesn't work. They are mostly silent when they do work. EH chargers are mostly at busy Motorway services. EH chargers see more customers, so we see more posts.
Someone could start a user based project. Everyone taking place has to log detailed results of every single public charge attempt. There is still the possibility of sample bias, but perhaps that could be adjusted for.