Let's sort out that log of events. I think it was written by Malcolm Bonnet who was receiving messages via radio. It was not written at the scene in my opinion.
Both logs are indicate as coming from an 'exchange line'....... no 999 calls. So this means if two calls by two people both parties will have had to ring directly. Jeremy had to look up the number for Chelmsford Police Station. Would Neville Bamber have looked up the number for a Police Station whilst Sheila was going beserk with a gun?

Also the judge, in summing up the case, gave the defence the benefit of the doubt re Jeremy's call to the Police being at 3.26 am as opposed to 3.36 am.
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The trial judge, Mr Justice drake, gave the defense the benefit of doubt over this matter, because it was being argued by the prosecution that the timing of the call made by Jeremy to his then girlfriend Julie Mugford, had been made after Jeremy's call to the police, not beforehand...
Jeremy stated that he called Julie at about 3:30am, which was after the call he got from his dad, but before the timing of his call to the police at 3:36am...
The timing of the 3:26am, call was introduced by the prosecution to suggest that Jeremy had called the police before he called his girl friend, and that he had called the police at 3:26am, or thereabouts, which was minutes, before he called Julie at 3:30am? The prosecution also got Julie Muforgd to introduce the argument when she testified that the timing of Jeremy's call to her that morning had happened at about 3:15am, not 3:30am, by relying upon the suggestion that a clock which was at the premises where she was in digs was 15 minutes fast...
Imagine that, the clock in the control room 10 minutes fast, and the clock in London in the house where Mugford was in digs, also being 10 to 15 minutes fast?
What a coincidence.,..