received from Utility Warehouse 22/3/18:
Thanks for getting back to me.
Yes, correct. We don’t install Economy 10 meters, but if you come over to us with one, you can still benefit from the 10 hours lower rate they offer, but under an Economy 7 rate.
The same happens with the more complex, 3 reading ones.
I hope it helps, but let me know if you need anything else.
Thanks again and have a nice day,