Iam apparently TB was one of several men questioned in relation to the girl's suicide, and the events allegedly leading up to it. The girl's complaint was dismissed as fantasy, and at some point, although it's not clear when, the mother withdrew the complaint. The diary itself has not been made available for scrutiny, either.
Dame Janet has access to a memo (pictured in the press yesterday) that states that TB was interviewed over the affair by Billy Cotton, then Head of Light Entertainment, and another senior member of Bbc staff. Both are now deceased. However, TB is denying that the interview ever took place, and no notes of the interview are now in existence (if indeed they ever were).
What Dame Janet is saying is that TB lied when in fact he cannot remember being interviewed. And as she is unable to find any other evidence of the interview, surely she cannot then say with any real authority that the interview did in fact take place or draw any conclusions from evidence that does not exist, and 45 years after the event.
I don't think anyone is "blaming" the girls involved for what allegedly happened to them, merely stating that times were very different then, which indeed they were. It was perfectly possible for a 15 year old girl to pass for much older in order to gain access to drink, pubs, TOTP recordings etc and yes, there were girls who did hang around much older men.
And the Beeb in the 70s is the organisation that brought us such shows as Benny Hill, where scantily clad women being chased around by lecherous men was classed as family viewing. It's not really surprising that the Corporation turned a blind eye to activities which would today be completely unacceptable.