It is ineffable that EV's will be taxed in some way or other. The only questions would be in what form would the tax take, and when would it be introduced.

In Car magazine, they give the energy cost per mile so a direct comparison can be made between the running costs (excluding depreciation and purchase price/lease cost) of any EV or hybrid vs ICE cars. For example in the last issue I read (November), in 'Our cars' section (long term test), the Jag I-Pace costs 4.6p per mile. Elsewhere in the same issue, the closest car in terms of purchase price to the Jag, a Land Rover Discovery Sport (£60k as tested vs £80k for the i-Pace), costs 21.8p per mile. Over two years doing 15k per annum the Disco would cost an extra £5160 to run.

Point being that (and this is obviously ignoring the current charging infrastructure problems which is a separate issue) even introducing some kind of tax on EV's, they are still likely to be much cheaper to run than an ICE car.

Expect VED to rise in the UK for ICEcars and then in a year or so a charge for Electric cars too.

No surprises there then!