I think you're nearer the mark Rod. We could either say Julia knew of the up and coming visit to Menlove either because the Wallace's conversed, she was bound to ask where William was going that night etc - or it was so that when Qualtrough called unexpectantly on tuesday, he would be let in to wait to William's return.
We could go further and say the stranger then planned to do the sneak robbery only and it did go wrong when she spotted him and he had to commit the murder or that the murder was planned all along and the robbery was just done to make it look like that was the sole intention?
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Either way, and especially because of the false statement given to the police which should have been checked out more thoroughly, Parry has to be involved. I'm thinking Parry, the amatuer actor who expected WHW to be at the cafe is Qualtrough - the false statement fits it too. But, he is not the murderer but did pick him up afterwards and dispose of the weapon which then fits with John Parkes/the Atkinson's story.
If only the police had taken that seriously, they may have searched those Priory Road drains and this thread would be a whole lot shorter
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