Mr Red wrote: But are you going to run the washing machine while you are in bed?

We've just moved from Hertfordshire, where we had a dual day/night rate meter, to Kent where we don't.

Yes, we used to run the washing machine, tumble drier, breadmaker, dishwasher, overnight. (It feels really odd running these machines during the day.) No, it didn't keep us awake.

I would expect future tariffs to reward you if you avoid, e.g. the evening peak cooking hours. But no such tariffs exist yet AFAIK, so I'm guessing.

Apart from the hacking aspect, I can see no good reason for not fitting one. You don't have to take any notice of it. You won't get a future choice of tariff without.

SRS: interesting. In the UK also you need to keep changing supplier/contract to not be ripped off.