Wow, riots, in romford? Been there back in school with a student exchange program. Very fond memories of the Sir Frances Bardsley School for girls...
But I digress: While I do understand the frustration with those youths jumping in on an opportunity to cause mayhem and looting, you guys suggetsing shooting them can't be serious.
Not only is that a way overblown reaction, I highly doubt that killing teenagers will calm the situation. Reacting to violence with more violence rarely leads to desired peace, especially nowadays.
IMHO, the only smart thing the government can do is try to not escalate things further themselves by acting too violently, but rather let it cool off, arrest people aftwerwards (yes, i do know they will only get a low percentage of the looters) and then see how to deal with the finacial and material losses.