@andypiper They have said that any IOG charging over 6 hours will be charge at peak rate (49.61p) - more expensive than going to a public charger!
Effectively it means you never want IOG to allocate a charge period outside the normal overnight because it will cost you a lot more - the simplest way to achieve this is to switch the intelligent part off.
I didn't get any notification either but they're already doing it..