I have to say that my first thoughts are that WHW, Parry and Marsden working together on this murder is not only unnecessarily messy but highly unlikely due to the relationships between the 3 beforehand.
I take it nobody is giving any credence to Tom Slemen's theory that it was John Johnston?
That theory to me exonerates Parry which I cannot see myself.
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Also, was it such a masterplan or just bad detective work with an attitude of 'we have our man' despite other possible avenues to explore which weren't - even including his route and timing to the chess club on the Q night.
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