Just out of interest, and accepting that no-one has been charged, let alone convicted
how would the fact that (so far, to the best of my knowledge) all bar one of those arrested are under 16 affect the views of those proposing to raise the age of criminal responsibility to 16 or even 18? Given the apparent prevalence of teenage offenders in IT related crime, this could lead to an interesting impotence on the part of enforcement authorities if it ever comes about, with consequent issues for the industry as a whole.
I'm not sure about the effect on any civil claims for damages (e.g. TalkTalk sue the kid for £M), and whether parents or guardians are vicariously liable, assuming the youth's assets amount to little more than a console and a tablet, and possibly some expensive sneakers.