since having an EV we have been with Octopus but only on their go faster (5hours) and then reduced to 4 with Go but a full charge required 8.5 hours this is because we had a Stellantis vehicle they don’t link with. So we wanted a vehicle that could be linked with their Intelligent tariff this gives 6 hour of low price 7.5p from 11.30 to 5.30 but like yours they take over when you plug in and create a charge plan which maybe within or outside of these hours but you will still only pay the low rate unless you override to immediate charge. The benefit then is that you still always get the 6 low hours as well regardless of their charge plan. This also works well as the new car only takes 5 1/2 hours for full charge this is where often people fail to realise big battery and long range cost more hours so many have a battery that can only be half charged cheaply at home.
I am the carer / driver for my wife who cannot drive due to disability