Getting back to the letters,a psychiatric expert in the forensics of letters written by a suicide patient will distinguish between a letter which had been written as being " despondent " or one which indicated insanity. Because the addressee was " Mummy ",it would indicate that the murders/suicide was an act of blame for which had Sheila survived,she'd have faced a prison sentence as the letter would have proved her sane when she wrote them. Sheila was also angry towards Colin,another act of blame included in the letter. Added together,these proved that there were relationship problems as well as others,in which the author tries to justify their own feelings and not those of others.
Sheila also told those that she'd met/befriended that she didn't get on with her mother,so the seed of blame and despondency was already planted. Many who knew Sheila had been fully aware of this,including her psychiatrist.
I can't imagine or envisage that anyone contemplating suicide would write a " composition " on their life before taking it !
Forensic psychiatry has come a long way since the mid-80's and if the said letters hadn't been ignored in the first place Jeremy wouldn't be where he is now. Apart from other aspects of the case !!
