To my thinking if the caller was Parry or Qualtrough and assuming Wallace's innocence (so the caller wouldn't be working for Wallace), if this caller had stalked Wallace, seen him leave and then called the club and was told he wasn't coming, the caller was in a tough spot. He would either just be forced to abandon his convoluted plan, or if he was determined and convinced that Wallace was indeed likely going after having seen him leave (although how could he know for sure where WHW was going), he could demand Beattie leave a message "in case" Wallace showed up. Asking for Wallace's address would be the last thing he would do and wouldn't make much sense. If Beattie gave it to him, it would further curb the faltering plan.
Crucial point here... If however the caller was Wallace, then knowing Beattie doesn't have his address, it would be a tactic to implicitly explain why he needed to ask Wallace to call around to his address instead. Because he does not have Wallace's address, so Wallace will have to come to him! This is quite obvious and stands out in Gannon's full version of the exchange as the caller after being told to ring later, refuses and asks Wallace to come to his address instead. This right after asking for Wallace's address. Whether the caller was Wallace or it wasn't, whoever this man was, it appears was working on some sort of devious script with an agenda. If the caller was Parry (and not working for Wallace), he would have no way to know Beattie did not have WHW's address, so this would almost certainly not be one he would have come up with.
What do you think?
PS. Beattie ends up taking down the address and repeating it back to the caller and actually says he will give it to Wallace "if he sees him, but he may not be here tonight" If the caller was truly not Wallace or working for him, then you couldn't blame him for being VERY unconvinced that Wallace would get the message at all or that he did , it would be accurate. Let alone that he would follow up on it! And LET ALONE that Wallace would tell Julia about "Qualtrough" so she would let him in as the ridiculous Parry Accomplice theory goes. As we know, Wallace did tell Julia about Qualtrough, but there is an alternative explanation for that

Since this exchange is so detailed, it is very difficult for me to believe Gannon made it up. It has to be in the full police file and/or trial transcript IMO.
Final point: Although I agree with Murphy on practically everything, he does say that perhaps the caller said West and it was taken down as East. If Beattie repeating it back to make sure is accurate, this seems unlikely. Although perhaps if the caller was Wallace as I suspect, he didn't want to stay on too long and start correcting Beattie

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