I have just bought an electric car
Its a  a 75kWh car which takes 75 units to fill from completely empty to completely full.
So much do i get charged?
Charge for electricity
It’ll depend exactly where you are in the country (there are slightly different prices per ‘grid region’  use https://bulb.co.uk/tariff/ to look up your specific rates).
Working on the following assumptions:

You live at Buckingham Palace, SW1A 1AA (hello your royal highness if you do!)

You are filling the car entirely from empty at the time (which I believe is impossible as the batteries won’t allow you to discharge that low)

The “75 units” correspond to 75 kilowatts (which matches the 75kWh)

We can ignore the ‘standing charge’ of about £7.37 per month as you’ll pay that no matter how much power you use and we can ignore the dual fuel discount.

You are filling up during ‘night rates’ on an Economy 7 meter
Night rate is 6.584p per kWh * 75 = 493.8p = £4.94. 
You are filling up on a nonEconomy 7 meter
Rate is 11.949p per kWh * 75 = 896.175p = £8.96
Which is close to expected figures on https://evchargingsolutions.co.uk/evchargingcosts/  a Tesla Model S has a 100kWh battery and would cost £10.00 at a unit cost of 10p per kWh so £8.96 for 75kWh is within the right region.
@RichyB Spot on! Couldn’t have explained it better myself @dennisotter If you’re not already a Bulb member head here to get a quote https://join.bulb.co.uk/join/quicksignup If you are you can view your tariff detail to work out the cost of the units. Congrats on the new car!
Thanks Guys so much ,. I live WHITTON LONDON TW4 5PR west London, so how much would that be ?
Based on this quote for a property in your area:
You would be paying an Electricity Unit Rate: 13.010p per kWh
If you’re Tesla takes 75 units to fill up that will cost £9.76 (seems like a bargain to me!)
Hope that answers your question @dennisotter
Thanks…its a bargain indeed but the car was an expensive purchase so got to look after the pennies now…