That isn't established. You posted just hours later, "Worse case scenario - there was overlap of the line in usage (a) to (c) and (b) to (c) whilst Jeremy was speaking to police from his cottage for a period between 3.36am and 3.42am, a total of 6 minutes", and the two logs don't prove that Jeremy was still on the telephone to Pc West after 3.42am, or that the telephone line at the farmhouse was checked by the operator while Jeremy's call to Pc West was still in progress.
Hi Reader,
If Jeremy's call to police took place at 3.36am, say it lasted 11 minutes, this would take the duration of his call to the point of termination as being 3.47am. Since the line from the scene (whf) was still in use and the GPO confirmed at 3.42am that the phone had been left off the hook, it must follow that there was overlap between Jeremy's call to police (3.36am to 3.47am), and the activation of the panic alarm from 3.29am to whenever, there must have been a period of overlap involving the line from Jeremy's cottage, and the open line from the scene (whf) between 3.36am and 3.42am, where police were dealing with the call from Jeremy, and the open line problem from the scene...
I describe the open line from the scene, (3.29am to 3.42am, and beyond) described as being problematic, because it was as a result of the panic alarm fitted at the scene being activated, but at some stage after this, someone at the scene, lifted the telephone handset thus creating an open line connection, and placed the handset onto the kitchen worktop, the latter was done at some stage between 3.29am and 3.42am...
Basically, what I am saying is that it would have been impossible for Jeremy Bamber, to be responsible for shooting and killing Ralph, for Jeremy to lift the telephone handset after the panic button was activated at 3.29am, for Jeremy to stage manage the scene as alleged by the prosecutions case at trial and since, then leave the crime scene without leaving any trace that he had been there at any stage of the shootings, got on June Bambers bicycle and ridden home to his cottage along the coastal footpath, in time for Jeremy to use the phone at his cottage, to make his call to police by 3.36am. It could not be done, not by Jeremy, not by anyone...
There was a basic difference between the call made by Ralph to police at 3.26am, and activation of the panic alarm at 3.29am, followed by someone at the scene lifting the telephone handset and leaving it off the hook whilst the alarm was still in progress. It created a loop in the system that the police could not deal with themselves, and required them to seek the help of the GPO, which took place at around 3.42am. All of this is consistent with someone still being very much alive inside whf after 3.29am when the panic alarm was activated, and the telephone handset was lifted and left off the hook...
I understand that if someone had been using the phone when an attempt to activate the alarm was undertaken, it would have failed, because the successful activation of the alarm from the scene (whf) required unrestricted use of the line. The alarm could not be successfully activated whilst the phone was in usage by someone at the scene - so police knew that after the panic alarm was activated that someone who was still alive inside the farmhouse lifted the phone and left it on the kitchen worktop, possibly in the mistaken belief that police would be able to eavesdrop on the developing situation...