Thanks Girl X for responding - I was actually thinking more about people who do smack or tap or whatever people call it - would they feel comfortable if someone else did the same thing? I'm not in that position with my kids as we don't have grandparents or family around very often.
I have said often enough now that I don't believe the law is clear, and I don't accept that just because "good" parents don't go too far the law works. My mother definitely went too far, but I have a terrific relationship with her these days, and have been a model citizen pretty much my entire life, which is why I personally find anecdotal evidence difficult in this area. Those same good parents would have probably found other ways to discipline or manage situations if smacking had not been an option.
Sometimes gov'ts are compelled to act to protect the most vulnerable even though the majority are not in harms way. I just don't see why the College of Physicians would be pushing for this if it was a problem that didn't exist.