That's another thing I find odd about this case. I know coppers aren't all renowned for being bright, but you'd have thought that anyone with even the most basic grasp of investigative techniques would understand enough to e.g. keep away from CCTV, be aware of cell siting of phones, not provide their real details to the hire company, leave a trail of their movements through card payments, bury a body on their own land, etc. Maybe he was thick, maybe he was complacent having got away with similar before, or maybe it was just the arrogance that nobody would believe it was him.