Was that rather like his work in the Jill Dando case then ?
Can you remind me as to Horrocks experiences in missing children cases ?
If you read into Mr Horrock's research and background, you would be aware that a missing person or child for whatever reason, normally has the same reasons for going missing. Bring to bear his extensive knowledge of deconstructing crimes scenes with support of forensics and then using it to present a file to the CPS does tend to suggest to me, that his overall knowledge of crime detecting and prosecuting can be taken into consideration. And not to be looked at such a granular level that it can be, in your case instantly dismissed.
The assassination of Jill Dando was a case that put the entire constabulary and MET police under intense pressure and scrutiny. Critical thinking and mistakes were made and this was perfectly highlighted when Barry George successfully appealed the case. Mistakes were made as with any criminal investigation but what was dire that the forensics were cross contaminated.
I assume you bring this case up because of Mr Horrock's view of this given the experience, they were all misled by inaccurate forensics. This happens, not just in the UK but other countries as well.
Again though, given all this, bringing up his lack of direct handling of missing children cases, or his view on the flawed investigation into Jill Dando is still not an argument