2
If Frank Cornish, who met Mrs Bain, had not talked about Mrs Bain to Craddock, Craddock would not have known about Mrs Bain.
If Marina Gregg, who saw the murder, had been an optimistic person, she would not have had a nervous breakdown.
If Marina Gregg, who was a very suspicious person, had not said the reason why she cracked up to Dr Maurice Gilchrist, Craddock would not have known the reason.
If Marina Gregg, who gave her glass to Heather Badcock, had not thought that the poison was for her, she would not have had a neurasthenia because Marina Gregg did not know Heather Badcock very well.
If Jason Rudd, who was Marina Gregg's husband, had been compliant, Craddock could have gotten more information