As for electrical patio heaters, I have seen these things used outside several pubs since the 'smoking ban' was brought in on the grounds that smokers still wish to have 'a cig with their pint', and sitting outside in the freezing cold of winter is not an attractive proposition for anyone. Perhaps if pubs were allowed to provide both non-smoking and smoking rooms...
Sorry to stray slightly off-topic!
Interesting point actually.
The green anti smoking brigade drove out the smokers, firstly to separate bars, then outside with the patio heaters.
So saving their lungs is destroying the planet in a bizarre kind of way.
So if patio heaters are an evil of modern society, the pub ones are their fault.
I like it.