@MikeInWimbledon Maybe it was a E350e or a E300de? I can't see that E350de was sold in the UK.
I'm not sure where he's getting 7 quid from as the cost of charging such a small battery. The E350e has 6.4kw battery and the E300de has a 13.5kw battery.
Neither of those cars can use rapid chargers (which are typically more expensive) so it's just the slow chargers that can be used.
I use two options for public charging; BP Pulse (requires £7.85 monthly subscription) and then after that some are free to use, but some charge a small fee for electricity.
I charged my C350e in Canary Wharf the other day (3.82kwh of electricity supplied) and the cost to me on BP Pulse was 46 pence! Electricity was charged at 12 pence per Kwh!
Similar with PodPoint (no monthly subscription) but when I charged my car near Trafalgar Square, I was charged 70 pence (but more importantly I got up to 4 hours of free parking which itself was worth over £20!).
Yes, the cost of charging is going up for Instavolt customers (but that's only because everyone else was already charging 20% VAT on charging and they weren't) but I still can't figure out where the chauffeur Thanwas getting £7 quid for 20 miles of driving a plug in hybrid E class. Even if he had the E300de with the 13.5kw battery, he wouldn't be paying anywhere close to £7 quid to charge it at a public point)
Plus if you were to charge a VW ID 3 electric car with a 58kw battery at an InstaVolt rapid charger (at their revised rate of 40 pence per kwh) and for the sake of argument, you used 50kw of electricity, the cost would be £20 for about 200 miles of driving.