A point from the other side of this:
Let me ask you, Real Justice, and anybody else interested, a hypothetical question. Let's say you are awoken at 3 a.m. (or whatever time it was) by a phone call. Would you be able to recall word-for-word what was said? Even 10 minutes later, could you recall it?
I have to be honest and say that I think I would struggle and I'm impressed by Jeremy's feat of memory, as well as his ability to bounce out of bed at all hours.
I am sorry to say that Jeremy's ability to recall what Nevill told him with some precision does lend itself to the impression that the call never actually happened and Jeremy was reading from a script when he spoke to PC West and has been reading a script ever since.
I would have found it more plausible if he bluntly admitted that he couldn't remember exactly what was said and what he was reporting was just a representation of the call's theme - i.e. "My dad said Sheila was carrying on, he mentioned a rifle, and told me I needed to come over right away".
But I don't say I know. I draw no firm conclusions. Really, only Jeremy knows if he took that call because there is no independent technological way to corroborate either that he did or didn't. If we're honest, we have to admit that.