So it's cost you £582 to do 14,399 miles? <Insert impressive meme here>
I'm just doing some math... for me to do that many miles in my Ford S-Max (not that we would because it averages low 20s mpg) it would cost me over 4.5K in petrol annually.
So with petrol prices taken to currently be £1.45 (I've not filled up for a few weeks but this was the last price I remember) £582 worth of petrol buys you 401 litres. Which is 88.2 gallons.
So to match your miles to GBP cost with your elec car, you'd have to have a petrol car that did 163 miles per gallon I make it.
Diesel would be about 172 mpg (used £1.53 as average price).
So if we assume the average modern day similarly spec'd ICE car would average 40mpg, you are still more than 4 times cheaper than fossil fuels. For now...