I would imagine that the reason these women did not come forward sooner could be as follows:
SIR Jimmy OBE. Decorated by the establishment, known for charity fundraising, volunteering at Leeds Hospital, public figure, powerful man. Who is going to take the word of a young girl over his? Lokk at the admiring supporters who lined the streets to wave his coffin off - would you stand against those people and decry him during his life? The abuse would be incredible. Consider those who do nothing more than die in a particularly upsetting or note-worthy fashion. Within minutes, there's a -taking FB hate page, mocking them. Imagine if you stood up against a man who was known PUBLICLY ONLY for doing good? Public villification (such as they are getting now) would be hideous and heap more misery onto the initial abuse.
Failed investigations: In the victims' mind, this probably means he would get away with any accusations/investigations held. This is the reason why, in 2012, the majority of rapes go unreported. In addition, some of the girls were in a home for troubled girls I they already have besmirched reputations. Look at thew testimony of the girl who tried to tella nd got locked in solitary for days until she recanted. Do you think other girls thought it would be worth telling the truth?
Shame/Guilt: it was my fault, I went to his dressing room/camper van/home.

Parental supervision is another matter all together. When I was 13 (in the 80s) I was allowed to go to town alone/ with friends and to the cinema etc. If I'd lived in London, I would probably have been allowed to go to a recording of TOTP - the BBC is regarded as a quality institution, and Savile a harmless eccentric. Again, the onus isn't really on me not to get abused and taken advantage of, the responsibililty lies with the adult.

In 30 years, hobviously. Haven't you been paying attention?

Basil Brush.....

Ronnie isn't under suspicion is he? There was never much of an explanation as to why Rita cleared off and left him

Didn't she take the kids with her as well?

max clifford ffs. that is the ultimate definition of irony