I can’t fault Octopus at all, I got smart meters fitted by them as soon as I got the car, then waited months for the OHME Home Pro to be fitted (due to needing permission from HA) and switched to Octupus Tracker in November, not seen rates above 20p/kWh since.
Just charge it whenever it needs charging and averages out around 16.5p/kWh since we joined.
Costs me less than 4p/mile, and no expensive day rates.
Current: 2023 MG4 Trophy (soon to get rid)
Ordered: VW ID4 Match Pro 210kw 77kWh [Blue Dusk] Expected August!