Re: Complete and utter waste of money unless you want to spy on people
Take a look at Octopus Energy's Go tariff.
I pay 14.63p/kWh throughout the day, then 5p/kWh for the four hours between 00:30-04:30. Perfect for the car/dishwasher/washing machine - not chancing it with the tumble drier though.
They're a significantly sized provider too, so not likely to collapse any minute like some of the smaller ones that offer decent demand-driven tariffs. Plus, look at the ratings on impartial comparison sites and they wipe the floor with the others. They're far from perfect, but still market-leading when it comes to CS.
And I'll shamelessly plug my referral code if you want £50 credit on your account: https://share.octopus.energy/ashen-llama-820