Hi Scip
Not sure what you mean about Jones overlooked so many problems. Not even sure what you mean about Julie did not rat him out right away?
It is unfortunate that the during the trial that it was not emphasized enough that Jones did an examination of the windows and deemed them to be secure, meaning they were closed and fastened. It is my opinion that a window cannot be locked and secured from the outside, especially sash corded windows.
It is not luck that plays a part in this case it is facts and the fact is that there were 3 extensive examinations of those windows and it was not until the 3rd examination see RWC/8 that it was identified that a catch was marked on the 28th September 1985. Given the fact that JB entered that window on the 16th September 1985 there is a suspicion that there was an after the fact conclusion that JB had entered that window on the night of the murders and basically that was not correct. It was only on the 3rd examination that this was noted. This means that this evidence is unsafe for it it logged that JB entered the house via this window after 2 full extensive examinations had already taken place, where no evidence was found on this particular window....So, it is seems! 
I mean exactly what I said about Jeremy being lucky. If Julie told police that first day what she said a month later it would have changed the police approach to things.
Since she didn't Taff Jones simply took all of Jeremy's claims at face value and that he did so was lucky. Taff Jones totally ignored evidence that suggested Nevill was shot in the bedroom and decided straight away that Nevill was attacked in the kitchen while on the phone. I have highlighted in other threads how off his reading of the crime scene truly was. The firearms officers didn't agree with his reading but it was his call not theirs.
He was lucky that police didn't do a thorough search of the entire house. They should have taken every bullet and firearm/firearm related item in the house. They didn't though and this resulted in them not finding the moderator. His luck ran out when the family turned it in. Police might have went looking for it anyway after Julie came forward but still might not have we have no way to know for sure.
When police determined he staged too many bullet sin the kitchen he was questioned about it, was unable to account for such and yet Taff Jones thought it unimportant.
Because the family said Sheila wasn't into guns Jeremy changed his tun and said he didn't know her to ever fire a weapon. The change set off no red flags. Taff Jones ignored that he told numerous police she used all weapons in the house and that he even trained her to use the murder weapon. Taff Jones totally ignored that means she would nto have known how to use the murder weapon he simply decided since she lived on a farm she must know how to use the murder weapon though it was the first semi-auto they ever had and growing up she only would have seen shotguns being used.
When it became know that Jeremy could get in and out through the windows Taff Jones decided to ignore such.
These are all things that should have set off red flags but were completely ignored and that is just plain luck that Jones ignored such and was so convinced. You could just as easily get a cop who would be the biggest cynic there is. Jones was a lower rank than should have been the lead investigator for such a serious crime, that was extra lucky then that Jones was in charge. But as I said his luck ran out. The reinvestigation started before Julie came forward. The amount of red flags resulted in the decision to replace Jones. They did so by placing someone above him of the rank that should have been in charge all along. So his luck had already run out on the moderator and Jones being replaced by the time the last bit of luck was gone and Julie ratted him out.
But for his luck not changing he could have gotten away with things.
What if Jones remained in charge, the moderator was not re-sent to the lab for further examination and Julie had not ratted him out? Police might have concluded it was murder suicide and he goes free. Sheer luck played a big role in the final outcome.
As for the window, all Jones didn't go examine the outside of the window for scratches nor did others examine them closely for scratches until months later. That being the case there is no way to know whether the marks were there or not at the time of the murders but it makes no difference. If Jeremy made the mark in September but didn't make any marks when going through it the times prior that doesn't help him at all. That effectively says he had the ability to get in without scratching the window so not finding any would not disprove he went through it. He admitted he had gone through it anyway which is the ball of wax. His great defense was no one could get in so it had to be limited to the parties inside. He admitted there was a way in and he knew about it and had used it in the past. That really took apart the whole defense about the events having to be limited to the 5 victims.
