"there have been at least three other 'media stars' who, it has been suggested, were involved in these claimed events "

At least two that I'm aware of at present. "Gary Glitter" and Freddie Starr.
Starr initially sought and won a press silencing gag, but that has since been overturned and he has now been named as the "third star" alleged to have participated in a group assault upon underage girls from the Duncroft home for (quote) "emotionally disturbed" girls.