A few surprises here, namely that PHEVs will pay a lower rate of RUCs, I was under the impression there would be a rebate scheme for petrol purchased.
No revisions to the weight brackets, which I imagine will be necessary before all vehicles eventually go to RUCs.
That sounds like a nice system, not sure how you would implement it in existing vehicles
Possibly via something that connects to the OBD port?
That would cover most cars on the road