Even before the police enter the house a rifle is seen leaning against a window. WPS Julia Jeapes - Firearms instructor http://miscarriageofjustice.co/index.php?topic=179.0
There is insufficient detail to say it was the same rifle as photographed on Sheila's lap later.
When the house was surrounded by over 50 police officers, who all believed according to Jeremy, that Sheila was inside with a gun holding her family hostage, so they were all actively LOOKING for a gun. Police are human beings and as nervous as anyone else.
The PC, who wasn’t a firearms officer, “thought” she saw something that “could” have been a gun leaning by a window.
In the event, when the armed raid team broke in soon after, there was no gun there at all. It was simply a trick of the PC’s imagination as she actively looked for one whilst standing outside.
The police went all through the house and the only gun they found was the one Jeremy had staged on Sheila’s lap.
Sheila had clearly been dead for many hours as she had liver mortis, blue mottling on her left arm, back and posterior, and was entering rigor mortis. Everyone else had been dead several hours too.
There were guns in Nevill’s gun cupboard, which hadn’t been touched by Sheila, including old broken guns in a store room filled with the usual broken things people sometimes store before dumping them...but there was no gun by the window. It was simply a shape of something resembling one that put the young PC on high alert as she was looking for one.
That’s all. Simple as that.
And it was established too.