Taking children to work

I knew this was well-established in the USA, but I hadn't realised that it had transferred to the UK, as EineKleineRob's post from last Friday points out.

Mind you, it seems that it hasn't really took off over here. And I'm trying to think why that may be: is it a lack of interest from employers, or from employees? Is it that children don't want to go, or that the school timetable is such that they are not allowed to go? (Seems in contradiction to truancy rates...) Is it that Health and Safety makes it too difficult, or it that those who would like to take children in have none to take (the postponement of having children)?

So many questions...

What strikes me as particularly odd is that you would hardly think the USA would be ahead of the UK on this matter. Any answers...??