Replying to myself -
Most of the articles on this trial are rather vague, but it appears as if the defence agrees that Hannah died prior to the car journey/fire - (at the Ballarat home) - but claims that the death was an "unplanned and spontaneous event".
The defence does admit that Lachlan later staged the car accident and fire to look like a suicide.
It's a strange defence, considering that there would not be a great many people who would share the joke.... quite the contrary, culturally,, many people have that particular occurrence as a total horror, .to be Burnt in a Bush Fire, along with being Lost in the Bush... it's a shared fear. The notes he wrote , pretending to be Hannah are disturbing , to say the least...
The bottom line seems to be one of financial greed, she wanted out of the relationship ( they had recently bought a house together ) and he saw his vision of himself as Lachlan Esquire dissolving, he could not afford the payments on his own... What she saw in him is one of the enduring mysteries, he has a face upon which no intelligent thought has ever landed.
Besides all that, he was already in the circle of those 'known to the police'.. in his case , known as a persistent thief and liar..... as a novel take on father/son bonding , Lachlan, and his dad went out knicking stuff from their neighbors and fellow citizens.. Apparently they felt their income was not indicative of their perceived status so they took to adding to their overall fiscal renumeration by becoming the scourge and nuisance of the area, finally being caught at it..
At the time of the murder. both he and his father were facing charges... There is no suggestion that Young Snr was involved with Hannah's death. that was all Lachlan's own work. He put a lot of work into planning this hideous murder. and carried thru with it with no hesitation,
It was truly a dreadful crime, and there is no sentence that would do it justice..