No it was not amarketing press realease - it was on the national grid web site - go and look.You read a statement in a marketing press release which suggested that something COULD happen.
This from the Gov Regs - yes I read them.
Regulation 10 requires that a relevant charge point incorporates default charging hours and that in most circumstances the charge point will only charge a vehicle during those hours.
Regulation 11 requires that, in most circumstances, a relevant charge point operates with a random delay of up to 10 minutes when it first starts charging. It also requires that a relevant charge point is capable of operating with a random delay of up to 30 minutes.
demand side response services” means—(a)increasing or decreasing the rate of electricity flowing through a charge point; or
(b)changing the time at which electricity flows through the charge point, wholly or primarily for the benefit of the electricity system;
So inbuilt is a facility to delay charging of your car for up to 30mins
When charging your car the rate at which it is charged will be controlled by the electricity provider wholly or primarily for the benefit of the electricity system; So you could find that your car did not charge to a level you were expecting
Also this from the regs
a measuring system, to measure or calculate the electricity imported or exported