[CMOTD]

I am not sure that Sainsbury's locally is free, I'll have to check next time I go 

Yes they are Tel, any Sainsbury's with charging points gives customers free electricity while they are in the store. Not the fastest rate but enough for 30 miles travel after an hour.

Returning to my original gripe:
regardless of your views on the merits or otherwise of EVs do you think it acceptable for a supermarket to give one section of its customer base (EV owners) a free gift while denying the same benefit to a much larger portion of their customers (IC car owners)? I am sorely tempted to put 5 litres of petrol in my car on my next visit and refuse to pay for it on the basis that I am also entitled to 30 miles of free travel!