Pinky McKay had something on her blog a little while ago about 'strangers' - basically that most assaults are by someone known, who's groomed the child and family for a while beforehand e.g. the sports coach, tutor, person behind the counter at the pizza shop, weird uncle etc It suggested if your child gets lost, or needs an adults help, look for a mum with kids as they're least likely to be a 'baddie'...worth looking for the blog post.