As I understand it, what's been claimed by Bill Robertson is that Jeremy called the police at 03.36 and PC West put Jeremy on hold at about 03.37 when he called Witham police station. Leaving aside the question of whether this happened or not, the theory can't be refuted by an appeal to the testimony of PC West, since the claim is being made that West in his testimony was lying and that he was involved in a police cover up.
If the police wanted to cover up the fact that Nevill called the police at slightly before 03.26 and that it was Nevill who was put on hold by West, when the latter called Bonnett at headquarters, then they would naturally be trying their best to make it seem like Jeremy's call lasted for longer than it did, if they wanted people to believe that Jeremy called at 03.24 and not at 03.36.
One thing which does not seem to have been addressed on this thread is an explanation of the timing of West's call to Witham at 03.37, where he tells the officer receiving the call that he has Bamber on hold. It is perfectly consistent with Jeremy calling at 03.36
PC West did not record the fact that he called Witham twice, once at 03.30 and again at 03.37 in his statements. There were definitely two calls since the first was by radio link and the second by telephone.