I agree @burnoutbabe . Some of the graphic details about how he disposed of the body were horrible. I suppose it showed us what a callous man he is (although we could already deduce that without the detail) and showed what horrible things police officers have to hear & see as part of their enquiries. One of the detectives was visibly shaken after that interview. But was it necessary that viewers heard those things? And what about Annette's dignity in all that? Did the viewing public need to know about the detailed violation of her body? I say no, we didn't.
Also what was with that ghastly bit of film about funeral directors preparing a body? That was completely unnecessary in my view.
24 hours in Police Custody was a good programme, showing how evidence is gathered, the deadlines to which the police work, and the deviousness of some criminals that the police have to use ingenuity, skill & hardwork to overcome. It doesn't need to be sensationalist.