There are two versions of the GO tariff. Intelligent GO works with compatible cars and chargers and will charge the car whenever the unit rate drops super-low.  I guess it’s similar to Agile in that respect, although in addition to ad-hoc charging during the day there is also a guaranteed low rate period every night.  But to be put on that tariff you have to have a car and a charger that the sign-up form on their website recognises and approves of.
The regular GO tariff is really just the same idea as Economy 7.  It gives you super-low rates overnight and slightly more expensive ones the rest of the time.  In this case it’s 5 hours overnight but no extra top-up hours during the day.  You don’t actually need an EV to go on this tariff because it’s designed for cars and chargers that they don’t support (apparently because the device manufacturer hasn’t built in the necessary software), so they can’t prove whether you’re actually using an EV or not.
---------- Post added at 13:28 ---------- Previous post was at 11:58 ----------
Just had a phone call from the installer … 7kW home charger coming my way in a little under 3 weeks 
