<snip>ETA now that SH has been charged with Perverting the course of justice, rather than assisting an offender, does that lean towards it not being her who gave them that information? Or possibly I'm inferring too much from the charge
That would be my understanding of it. I don't see how she could give the location of body parts but claim to be ignorant that an arrestable offense had been committed. Wouldn't be surprised to find that the 5th suspect released without charge was the one who alerted the police.