Given that all this time later, you didn't even know where the bodies were, I think you might have been kicked off the case quite some time ago! Besides, how can 'everybody' be a suspect? Think about it!
Where there are relatives etc,of course you have to investigate them too. Police know that this type of murder usually involves a family member.
Also farm workers and those who might have had grudges during Nevill's time as a magistrate. There are umpteen areas of investigation which EP never even bothered with.
Obviously you wouldn't have bothered either.