Could there be different timings for each region of the country?

I might be able to use some as we have grey skies forecast all day, otherwise it might be difficult!There’s plenty of green power in the wires tomorrow, and you know what that means…
Free Electricity Session 2-3pm, Saturday 5th July!
Get ready to fill your boots
Plan to shift any electricified activity into that hour, be it hoovering, laundry or realistically, sitting in front of a fan. The power you'd normally use costs the same. Any extra you use will be free!
Not on my Octopus account yet, but the savings session calculator (https://savingsessions.streamlit.app) says