Best answer by Toby
It sounds like you have normal smart meters, as the rate does not change in the day and night. So I would say that your understanding is correct. We also do not have a separate tariff for Economy 7 meters. Everyone pays the same rate.
Please do fill in the form if you feel that you should. Let me know how you get on and if you need help.
Great to hear that you're happy with your Leaf. Do you ever need to find charging stations while out and about or does home charging serve your needs?