Some understated criticism of the police for not finding the body for 3 months. My personal feeling is that their reticence can be partially explained by the wealth and status of the people involved.
Just on this point though - let's understand the enormity of the task!
IS did not report Helen missing until Friday
So potentially using a vehicle - that means the area for disposal is vast
In other unsophisticated murders I have looked at, the body does not turn up for years even though hiding it just meant dumping it in the woods.
In such cases, patience is rewarded