on the subject in hand, the article is about people who can charge at home. Im unable to work out the equivalent month of the year but I can say I worked out the cost equivalent over the weekend and per mile at an average of 4.0 miles per KW, the 75p per KW you find at Osprey or Gridserve (75%4= 18.75p per mile) is not better than petrol at £52 for 37l (8 gallon tank) at average 40mpg £52=320 miles.
EV 320 miles at 18.75p £57. Petrol 320 miles at £52.
however, if you use rapid chargers at 65p (16.25p) £52 and if you use a service like Elli or Bonnet 43p = 10.75p £34 (not including the cost of the service which is £5 or £13 a month). As long as you can charge for under 65p you will be beating the petrol cost. Wether it happens in august or february.
happy to have my maths corrected!