Well, I'd imagine the Saville case is far more important. It highlights how the role of women have changed since the 1970s - back then, it appears men in high positions could get away with sexual abuse. It also highlights how complaints made by women weren't taken seriously. We owe it to these women to get to the truth of what happened regardless of how serious the situation is or how long ago it occurred.
The rape of young girls, although very serious, is known about - what I do have issue with and has already been talked about by comment #3 is why does it matter that they're "Muslim." I really don't see your logic when you claim, "as police forces have admitted to being very unwilling to prosecute or even investigate, for fear of being branded 'racists'." Police do not prosecute people on the grounds of their nationality so I do not see why any defendants would make the old claim of "racism." Could you please substantiate your claim?