That's absolute tripe
It was originally termed murder suicide and it for was for a month
There was not so much scene preservation as there was collection
You are relying on 24 things you have invented that are nothing to do with the crime scene -
Invented conversations happening.
Evidence of Sheila being docile & uncordinated being wrong.
Rifle left outside by Nevill & June & repeatedly not put away.
Sheila walking on a creeking floorboard.
Nevill hearing things that are impossible to hear.
Nevill doing nothing worthwhile.
Nevill allowing Sheila to brutally hit his arms, torso and head upstairs. Continually. So hard the rifle butt falls off & Nevill's watch smashes.
Nevill not taking the rifle off Sheila.
June being awake but doing nothing.
Nevill ringing Bamber's AM. After escaping Sheila hitting him and after she has shot the twins 8 times.
Bamber picking up within 2 call attempts.
Nevill allowing Sheila to re load in front of him.
Nevill allowing Sheila to go back upstairs with a loaded rifle.
Nevill burning his own back 3 times.
Sheila getting help to pull Nevill downstairs. After the 2X upstairs beatings and 4 upstairs shots had killed him upstairs.
Sheila getting help to lift Nevill onto the coal scuttle.
Sheila moving the broken rifle butt & Nevill's watch downstairs.
Sheila smashing the kitchen ceiling light.
Sheila scratching the aga.
Sheila achieving everything between 3.10am - 3.50am.
Sheila finding someone to shoot her a second time.
Sheila shooting June at the exact same time Bamber answers. Nevill having super human hearing.
Sheila going into a rage unprovoked. Twice.
Nevill leaving everyone to go downstairs.