Well that opened a can of worms didn't it??
After having read all your comments, I would say that:
To take a child out of a car whilst paying for petrol is MUCH worse than leaving them in the car. We are talking a 2-3 yr old here, ie absolutely NO road sense whatsover, plus the instinct to break free and literally RUN at all times. No I am not that bad a mother but his father was/is an pre-olympic/commonwealth games 100m sprinter.
Not only that but the FUMES - I feel quite high when getting out the car at a petrol station so god only knows what it must do to a child. Lots more risks involved in taking them out IMO. I don't know cos I hate paying for petrol and kindly let DH do it. Its on my list of things I "don't do".
As for "popping into local shop for milk/bread" then realistically I think this ok too, but obviously as for a larger shop then no.
Is it very interesting though to hear your own childhood stories, and to realise how things have changed over the past 20 or so years. Those of you left for 2 or 3 hours, isn't that abuse/neglect?
I can remember being left in the car whilst my mum popped into a shop, but again not loner than 5 or 10 mins.
Would be interesting to hear where the line is drawn though in terms of legality.
Is it completely legal to pop in for milk and bread and completely illegal to leave for an hour whilst in tescos/morrisons? (Just to re-iterate not that I would).
Laughing at all paedo comments, although in reality also a very serious issue. I think in terms of car self combusting etc the chances here are very small. I think the major risks really are some undesirable getting in and harming children is some way along with a child managing to get out somehow. Again as someone mentioned you would have to constantly "review" the matter , and consider factors such as age/any siblings also in car etc.
I think to summarise then the general outcome from this discussion is:
YES TO LEAVE AT PETROL STATION WHILST PAYING FOR PETROL.
YES, DEPENDING ON INSTINCT TO LEAVE AT LOCAL SHOP WHILST RUNNING IN FOR MILK/BREAD,
A DEFINITE NO NO FOR ANYTHING ELSE, IE TO DO A LARGER SUPERMARKET SHOP, OF PARKING SOMEWHERE NOT CONSIDERED TO BE SAFE, IE LARGE SUPERMARKET.