JB's written note is unclear and possibly based on a misunderstanding. We don't yet know when JB wrote it.
The action contains "JB calls", apparently a reference to all recent known calls by JB, not his one call to the police (Pc West). We don't know what "Neville?" refers to. JB's dad was Nevill, not Neville, and is unlikely to have been referred to by just a forename, given that JB wasn't. No HQ recordings (in the sense of tape recordings) were ever disclosed, but JB hadn't called the police HQ, so his call (which was to Pc West) wasn't necessarily taped anyway. However, the HQ tapes would have been around for the police to use to check call times, and mike tesko maintains that the police did make copies of some of these, and never disclosed those copies to the defence.