What's your theory on why the killer wanted to kill Joy? She seemed to be a very well liked women. Do you think she has stumbled onto something with regards to the London Mission Group and has threatened to expose it?
I think it's highly likely yes.
It's important to note that the London Healing Mission at that time wasn't officially recognized by the mainstream church. Arbuthnot had been "defrocked" and yet he was still able to preach at the church despite multiple allegations of sexual assault through his use of "Internal Ministry."
So essentially, Joy attended the London Healing Mission to help with admin and clean etc... but the establishment itself was little more than a "Christian" cultist sect that practiced Spiritualism as it's primary focus.
The timing of Joy's murder occurring just after Arbuthnot's officially leaving the LHM is interesting because when Joy attended on the morning of her murder, Arbuthnot had only just left. I would need to check my notes, but IIRC he had only left a day or 2 earlier, possibly even the same day Joy was murdered.
The timing is very peculiar indeed.
I think it's likely that someone was aware of Arbuthnot's practices and went to Joy's flat under the guise of someone trying to help her for whatever reason. It's likely she knew all about the dodgy dealings of Arbuthnot and perhaps was silenced for it.
I believe the man caught on CCTV is the killer, and the man who made the 999 call and who started the fires himself, was his accomplice.
2 men involved.
The killer who was known to Joy went to her flat at 22.30pm and stayed chatting over coffee in the living room for about 20 minutes. At some point he has gestured to leave, but instead of heading to the door, he kills Joy in the bedroom, initially through strangulation to subdue her, and then by stabbing her repeatedly on the floor.
The sexual assault element is a ruse to cover for the fact the murder was intentional, and not about sex from a some depraved drug addict.
The killer then leaves around 11pm and goes out the rear exit that had no CCTV.
The accomplice is then told to go to Joy's flat and start 2 fires to destroy evidence, but because they cant be responsible for killing the other 55 residents, the accomplice has to immediately run down the stairs and out into the street (where he is nearly hit by a car) he then runs across the road to Fulbourne Rd and calls 999.
The fires aren't started until 23.15pm.
The real killer is probably half way home by the time the fires have been started. His alibi is the delayed timing of the fires.
So everyone is made to believe that the killer leaves the building around 23.15pm, but he had already left at least 15 minutes earlier.
That extra 15 minutes for the killer to return home is perfect for a cover alibi.
The reason why the man who made the 999 call never came forward, is because he was likely told that his DNA would also be in the flat and to keep quiet. Being a black male with matching DNA in the flat, would virtually ensure he is labelled as the killer.
But the real killer; the white male caught on CCTV is the real culprit, who planned to go the flat and kill Joy. He was likely connected to the LHM and the Arbuthnot's in some way. A man who held sway and influence over Joy; enough for her to feel compelled to let him in to her flat that late at night in just her nightdress.
That's my working theory anyway