@LUHE
Just to clarify, it is not illegal for a parent to smack their child in the UK. They can also give permission for a nanny or other carer to do so. There are limits on this and if it is deemed "unreasonable" then could be classed as an offence.
In terms of the WTS they have toned down the language they use in recent years and avoided saying kids can be smacked but they have never gone so far as to clearly say it is unacceptable under any circumstance. The JWFacts article covers this in detail.
Smacking children is still acceptable from what I see going on at halls and conventions. It is not uncommon to see parents take a child out into the foyer and give them a smack to try and stop them fidgeting. Not much calm reasoning going on there.
There was a discussion about this recently on a pro-JW site. The view that smacking was unacceptable was very much the minority.