[wraymond]

Simple. Every charging point, even domestic outlets, to contain a mini dedicated meter, they are very simple. Commercial establishments to charge before plug release or have credit card inserted prior to charging. Domestic charge points have separate tariffs which are added to usual domestic direct debit bills. These can be changed remotely to reflect duties payable as in smart meters so tax imperatives can be maintained. However, if total charges are equivalent to liquid fuel usage there is no cost advantage so will affect roll-out. Cost will always be a factor. There will be glitches, but there is minimal hardware, no outer premises or staff overheads and instant disconnection where required. Provider revenue (and their corp. tax) is liable.