Do you still have an old fashioned meter and it still works? I do & it seems to be working fine. Bills and meter reads are still consistent. I have left it on the cheaper night rate as I'm an insomniac & so will do the washing & drying in the winter. I dont use it for heating and hot water.
In the run up to the switch off at 30th June last year I was being hounded by my electricituly supplier to change but I did nothing about it. They're no longer hounding me.
I watched a tv program on channel 5 about smart meters the other night and I've not changed my mind about changing.