Not worrying in the instant case because there are, and were, several witnesses to the sexual assaults and the evidence gets more extensive every day. Savile would be convicted by a jury now because the evidence is not of one or two girls, now women, but one of system; same ages, same circumstances, same method, over and over for decades.
What is far more worrying is the 'trial by Sun headline' which is where a tabloid digs up all manner of information about a suspect, none of it admissible in court, all written up to be slanted against the man; 'a neighbour said that he always was a bit odd' etc. This stuff is run before and after any arrest and even after committal for trial