If the BBC runs Conduct & Discipline "CD" files, as other public bodies do, then that's where documentation of any such meeting would have been put.
Having said that, it might be feasible that one staff member does something inappropriate but out in the open, others witness it. Interview held; slapped wrist, lesson learned, there is no repetition or behavioursl lapses yet it is on file in perpetuity.
Savile, meanwhile, is surruptitious about his activity; people suspect but he is never caught in the act and no one has the confidence to file a complaint based on things they didn't see, first hand. Compounding this, someone with the authority to discipline him (line manager) declines to do so and his file is clean as a whistle, compared to the "one-off" case, above, serially offending, all the while. Not a classic "cover-up", with shredding/burning, just that procedures were never carried out in the first place - nothing to document.
The line-manager's priorities appeared to have been:-
i) protect the reputation of the star (who gets us ratings)
ii) protect the reputation of the organisation (be a team player)
iii) protect the reputation of self (appear promotable; do not trouble higher management with news of systemic problems which threaten the entire edifice)
iv) (conjecture) need 'n' years' service (10, in early 70s?) for pension rights, try not to get fired in year n-1.
v) (potentially libellous; redacted)