Having just had a ev charger installed recently i was intrigued to look into this as i had not heard of it before, and if you google it is by LAW that the DNO is informed that an ev charger is being installed at an address. I sent an email late last night to my installer questioning who if any should inform the DNO and i had a very prompt and nice reply back from them this morning stating it is as Kezo says above the installers duty to inform the DNO in that area. I suppose it is why many of us have not heard anything about this procedure.