Hi Adam
I have had dogs all my life and at the slightest noise in the dead of the night the dogs would have been alerted to that noise. Dogs have very sensitive ears.
If a window latch was being filed, by an hacksaw blade it would have generated some sort of noise.
I feel positive that the dog outside would have been on his guard and would have barked first having heard footsteps around the outside of the farm house.
One has to remember that the windows had just been painted and were stiff to open, again this could have generated more noise. The window evidence is clear that the outside and inside of the bathroom window was clean and that the window was locked from the inside. After two intensive forensic examination of that window they found nothing to support that it had been used.
Once inside the house it would be very difficult not to have alerted Crispy.......
The other thing is that the main bedroom window was open, so if the black lab barked I feel sure Nevill and June would have heard it....but, if it was usual for the Lab to bark then I can imagine they would sleep through it and people do when a cock crows....
If it was Jeremy he could have easily gone upstairs during that evening and had a look where the children were sleeping and looked where Sheila things were. He was fully aware of the layout of the house. Note that all lights were on, so I don't think any of the murders were done in the dark.
The main bedroom light was on, yet the officers that had arrived first reported that there was no lights on at the front of the house....A raid team officer is quite clear in his description that the main bedroom light was on. One has to ask who put this light on for all the other reports only say that lights were on on the white side. 
Hi Patti, I agree we were told several lights were on, I was just going by Adams belief of complete darkness to argue his point.
It's hard to be sure if lights were switched on and off while Jeremy was outside with the police or whether various police had inaccurate memories as some would explain it
So many different scenarios can be suggested, only Scorpio knows all the answers
