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I'm on their tracker now with a dumb gas meter and a smart electricity meter (we couldn't have a smart gas meter due to plastic gas pipes our side of the meter, but we're going to demolish that bit of the house so that will change).
I can't believe a.) how much credit we got back (because I originally asked a while back but it took me a while to OK it) and b.) how much cheaper our energy is now.
looks like you have to have a smart meter to join the tracker