It's one of those things which cannot be proved imo Patti/Ralph, it is all a bit ambiguous to me. Without concrete proof of a conversation having taken place I doubt it can be used as evidence??

I think that's probably the point I'm trying to make. As in...if a conversation in the correct form of the word didn't ever take place then it would have been extremely easy to be able to put that ambiguity to bed by producing the armed response teams reports from that night. If it didn't take place surely the reports would have gone along the lines of
'PC XYZ attempted to make contact with occupants of the farmhouse, via loud hailer, however all attempts were met with silence from within the farmhouse'
If such a conversation did however take place, no matter how brief it was, maybe just a shout or a scream heard from inside the farmhouse that led to the armed response unit attempting to make contact, then those reports would not align with the direction the case was going in & that would explain why they were never brought up, or used in court.
It would all be a lot more pertinent also if JB was at the time it happened, with a police officer, outside the grounds of the farmhouse ringing JM.
Please understand I am not claiming that anyone shouted, screamed or spoke from inside the farmhouse, so please don't jump on my words

All I'm saying us that every police unit is accountable for logging everything that happens at incidents that they attend & even in 1985 I doubt (although of course, I don't know for sure) that they would have all just left the scene, gone back to the station, handed their guns in & then gone home without having to fill in the necessary paperwork recording the events.