How much electricity are you using a day? If you are down at a few Kwh, you probably won’t notice it.
I have the smart meter set to half hour readings, and when our boiler was broken, I noticed that putting on a 2Kw panel radiator would show as 2 kw each half hour (I.e. 4 kw used in one hour). Easy to spot because nighttime uses is ~ 0.2kw in each half hour slot and my wife put the heater on a few times in the night. There were also stupidly high spikes whenever the oven and washing machine were on. Yes the spikes were where I would expect them to be but not the amount.
As I said, the amount they are taking off my account is correct and lines up with what the meter says. It was just a bit of a shock when I thought we were using £40-£60 a day.
Maybe yours and everybody else’s is OK but mine definitely isn’t. Whilst it’s fun to look at the figures, I now just read my meter every so often. Do a Google on “EDF” and “Kraken” and you will see they have basically lost control of their data processing.