Octopus have a tariff with dynamic electricity pricing: https://octopus.energy/smart/agile/
There's a (third-party?) dashboard of the data here: https://agile.octopushome.net/dashboard
There's a (third-party?) dashboard of the data here: https://agile.octopushome.net/dashboard
Does make it very clear where the afternoon peak is though, and that's a nice dashboard.