The BBC has become increasingly fond of using quotation marks in some circumstances. Now, logically you may argue that they are used when an event is unconfirmed. So for example, if a person was on trial for a crime, that crime would be unproven and would deserve quotation marks. Makes sense. Well, at least until you see this:
So, why does the trial of people involved in the alleged plot to blow up buses in London get quotation marks but the trial of two British soldiers alleged to have raped a girl in London not get quotation marks? I think you can make an educated guess.