It would mean they are using 183.5kwh a month at 50p per Kwh
So allowing for 15% losses (estimates range from 10 to 20% actual losses depending on the charger you use) this indicates that you'd be putting 183.5 / 1.15 or 160KWh into the battery. Their 10,000miles a year figure means this would have to deliver 833 miles of range, or 5.2 miles/KWh.
This is a reasonable figure to achieve with slow-speed urban driving in warm weather, but efficiency drops markedly when the weather is cold, and if there is any high-speed (greater than 50mph) work you can forget it.
Running an EV is cheap, but it ain't that cheap.
