When I was living in SYdney and only had two kids, I took them in with me. But I managed to avoid having to do it at all with the kids in the car all bar about 3 times. And they were both awake and easy to bring in with me and pay. Now we live in the sticks and I have 3 kidlets it's that bit harder, I would be very tempted to leave them in the car. I haven't been faced with it though thankfully. Though for me leaving ithem in the car would probably be just as traumatic for everyone as if I brought them in with me becaseu they would all probably end up screaming when I left them. So I'd probably end up taking htme with me anyway! Lucky for me I don't drive anywhere anymore any way everything is within walking distance!