I agree totally Ray, if something says 'not suitable' and that is backed up by medical proof then there should be a law stopping them selling it to those under age and penalties to suit (like they do with cigarettes etc) & have signed the petition :)
I think a big part of the problem is that kids/parents don't necessarily know the effects that these types of 'energy' drinks can have or if they do it's a minor problem and they just see it as a quick & easy boost but question is: would you give your child an espresso coffee ? somehow I don't think so
I'd guess action will only happen if the studies in the US find legitimate reasons to regulate and then possibly the UK will follow, but seeing as there are some seriously big companies producing the drinks I can't see it happening ;) although (according to Wiki) in Russia the sale of energy drinks is banned, Australia & New Zealand have restrictions in place on the amounts of caffeine they can contain & Latvia has changed the law to stop the sale of them to under 18's. France & Norway did have the sale of Red Bull blocked but it was lifted after appeal, so you never know :)