Bcm's idea is interesting. I would not condone active "resistance" or trying to fight back looters in the same way that locals have attempted in Dalston, and I'm sure the Police wouldn't either.

But I do wonder, if a large enough group of adult local residents (perhaps with some reflective vests or other gear that makes them easy to distinguish) was to simply stand along the high street, in front of every shop, with a cup of tea/mulled wine (it is cold enough for that, after all) and chatting to the person next to them, would these kids really try to attack? I very much doubt it. After all, they are still someone's son or daughter...

Anyway. Just a thought. (must get that last bottle of mulled wine out of the kitchen cupboard...)