Jim, Barnardo's is rightly concerned only with the child victims, and not at all with the ethnicity of their abusers.

You say,
""the children had 'been forgotten as discussion has focused on the ethnicity of perpetrators in high-profile cases."Which is what you are continuing to do here"

But, this debate is ABOUT whether ethnicity is a factor.
I am putting the case for an over-rep.
The quote acknowledges that ethnicity is an issue, at least in "high profile cases."
Also, quote from original BBC piece, "And, Narey of Barnados stated that there was an over-representation"