West made a mistake, not the whole of EP. Whereas Jeremy has shifted the times of his call(s) to suit whatever story he is trying to fit in - at the moment, it's a fictitious call from Nevill. The times given in Julie's first statement, were to support Jeremy's story - that is why there is a discrepancy between what she said then, and what she said later. I supposed all of the flat mates lied? For what purpose?
Jeremy hasn't shifted the times of any phone calls received by him, or made by him, unanswered or answered. The times attributable to the times he received a call, or made them, have been estimated or calculated by others on his behalf, using a methodical process involving when he could have received a call, or made one, irrespective of whether a call he made was answered or not. Why would Jeremy say he tried to call Witham police station before he phoned Julie but that he got no response, which was why he then phoned Julie, to tell her that 'there was something wrong at the farm', and she told him to 'go back to bed', only for it to be discovered that when Jeremy said he tried to call Witham, Bews, Myall, and Saxby were not present because the three of them had been called out to deal with another job. They did not return to Witham police station until around 3.34am, So, we know that what Jeremy said about not being able to contact anybody when he called Witham, is true. This fits in with Jeremy phoning Julie at 3.30am, and telling her that ' there's something wrong at the farm', and she tells him, 'to go back to bed'. Nothing whatsoever suspicious then regarding what Jeremy did right from the moment he received the call from Neville at around 3.25am. He tried to ring Neville back, got the engaged tone, he tried to ring Witham police station but got no response, he rang Julie, she told him to go back to bed. He then looked up the number for Chelmsford police station and rang them at 3.36am, and spoke to PC West...