Can't help but notice a trend, and my wife is a big conspiracy theorist so let's test it. We just came back from a holiday for two weeks, turned off all gadgets, tech and lights in the house (I posted elsewhere and this includes computers, printer, alexa devices, washer/dryer etc, and heating was baseline for the period) and there was NO change in our bill before, during and after... got us thinking!
Post how many rooms you have smart meter or not and rough price you're paying. Let's see if there's a massive statistical difference.
2 bed semi £400 with SM