"Contact a lawyer, how does anyone here know the reason why [they haven't been named]?
There is a multitude of possible reasons. The most usual is that of the age of the defendants themselves. But anything which might lead to the identity of minors will cause the judge to order their names be withheld. More than that, there could be reasons why, if they are identified in the press, they may not receive a fair trial.
The "alleged" vs "actual" is interesting. It is my view that all charges are "allegations" until proven. If you visit a a court you will see the participants (advocates, judges and magistrates) careful to ensure that the charges remain "alleged" during trials. You will hear them speak of the "alleged victim" and the "alleged perpetrator" (among other things). The only time you will not hear that is when the Crown is putting its case. You will then hear (for example) "The Crown says that Joe Bloggs assaulted Bert Higgins. We say that he hit him over the head with a bottle."