There are supposed to be 4 calls (in total), Neville's call to Jeremy, Jeremy's call to Julie, Jeremy's call to the police and Neville's call to the police. We're only discussing the last two which are documented - one written by West (Jeremy's call) and one documented by Bonnet (which is referred to as 'Neville's call). However, after talking to Jeremy (in which he told West his father had called and said 'Sheila has gone crazy etc.), West relayed what Jeremy had told him to Bonnet, he then filled out the 'Neville log'. It was most likely written as though it had come from Neville because that's the way West relayed it - i.e. Mr Bamber, WHF called to say daughter had gone berserk with a gun ......... etc. etc. followed by message pass from son of Mr Bamber.
Had the Neville log not been presented to the jury, I could see it looking a bit dodgy but this was the log what appeared at trial and it was explained and accepted. There is nothing in the log (info wise) that is different to the Jeremy log. The same information is present on both logs, it's just that West must have explained the details as if coming from Mr Bamber (Neville) and not Jeremy - which is why it states that the message was passed to the Control Desk by Jeremy at the end.
