NSPCC chief Peter Wanless has said Rolf Harris' decision to feature in a 1980s child abuse prevention video called Kids Can Say No shows his "absolute hypocrisy".
He told Good Morning Britain that Harris had commissioned an independent film company to make the video and then asked the NSPCC "about the accuracy of the safety messages" within it.
"I think this illustrated the absolute hypocrisy of Rolf Harris, there is no excuse for him not understanding the nature of the crimes that he was committing, here is someone who is absolutely providing children with good advice about how to stay safe," Mr Wanless said.
The NSPCC has received "an explosion of calls in the last 24 hours" from people worried about sexual abuse following Harris' indecent assault convictions, he added.
Rolf Harris has been sentenced to five years and nine months in prison for indecently assaulting four girls over a near 20-year period.
A woman from King's Lynn who inherited a Rolf Harris painting once valued at £50,000 says she feels like burning the art work.
A victim of Rolf Harris has told ITV News about the “nasty man who took advantage of his position” as a children’s entertainer.