I was interested, in the light of Peter Ashby's comments about the
child unfriendly nature of the UK, in the debate about a British
invention intended to repell, or perhaps expell, teenagers from areas
which adults would rather have teenage free.

see

http://news.yahoo.com/s/afp/20080402/wl_uk_afp/britaineutechnologyyouth

http://www.edmontonsun.com/News/Edmonton/2008/04/24/pf-5379181.html

http://www.foxnews.com/story/0,2933,352410,00.html

and many others