Could suppressing those e fits be regarded as perverting the course of justice ? ( given that it appears they were withheld from Scotland Yard whilst they were investigating the case )
I don't just mean with regard to the McCanns, but with regard to Exton too ... and the legal firm who made threats in order to ensure his silence
I believe that doing nothing is not enough for a charge of perverting the course of justice. They could easily claim that they didn't see the necessity for example.
" The Offence
3. Perverting the course of justice is a serious offence. It can only be tried on indictment and carries a maximum sentence of life imprisonment. The offence is committed where a person:
does an act (a positive act or series of acts is required; mere inaction is insufficient)
which has a tendency to pervert and
which is intended to pervert
the course of public justice."
http://www.cps.gov.uk/legal/p_to_r/perverting_the_course_of_justice_-_rape_and_dv_allegations/Ah, there you are!
As far as I understand it, it's the difference between noticing blood on your partners jeans and not calling the police and washing blood out of your partners jeans.
It's possible that using a solicitor to prevent someone else publishing the efits could be seen as perverting the corse of justice I suppose, but not doing it themselves isn't a crime.