My explanation is what I said before.
Jeremy phoned Julie for a chat.
Jeremy dialled Chelmsford police station (it did not occur to him to dial 999). Chelmsford police station was miles away

Jeremy told PC West about the 'mysterious' (judges words) phone call Neville had made saying 'come quickly, Sheila has gone crazy & she has got the gun'. Luckily, or unluckily Jeremy had switched off the answering machine, so brave Jeremy could answer the phone & save the day. Although he wanted the police to pick him up !
PC West phoned Witham police station which was 7 miles nearer. The police like to save time when there are nutters with guns involved.
I assume both West & Bonnett filled out call logs. There are differences. So what ?