[user104658]

Sadly Kirk I also think the problem is so bad in certain areas of London (and other cities, but mainly London) that no amount of "good parenting" is guaranteed to help. Kids hit their teens and get swept up in it all and are lost to any parenting very quickly.

My advice to anyone living in one of these areas who have young kids that are so far protected from it? Would be... Leave. Just leave. If you're living in a deprived area then you can't possibly have any strong economic link to London so move your kids away from the city before it's too late.