Something to pass the time:
You have a chance to go back in time (any date, any time) and choose a half hour slot to observe only (you cannot be seen or interfere with anything) any relevant case activity that would convince you of the murderers identity, bearing in mind the times the victims were killed is not known.
What specific half hour slot would you choose, where would you be, and why?
e.g 12:30am - 1:00am on 7th August 1985 - in WHF - in the hope the murderer is active and recognisable (of course it could have all been over by this stage, but that would point to JB).
Would a clincher be;
3:00am - 3:30am - in the WHF kitchen - did Nevill make a call or was he already dead?
Got any others?