Thanks Mark, really helpful work.
It is a strange set up for us to understand, as in the last 12 months we have moved to a new-build property with Economy 10 installed. We are served by EcoTricity. When I phoned to confirm our off peak hours they turned me away saying they don’t support Economy 10. After our first bill, they now do (!) so we have been with them almost a year. Expensive but good customer service and Eco credentials.
Thanks to your hard work, we are now able to compare the market a bit better. It seems that more is on offer than advertised (as shown by EcoTricity).