Professor Bernard Knight for the defence had stated that a Bible was part of a ritualistic scenario of suicide.
As in Claire Powells' book,there doesn't appear to be any reference made to the blood on the Bible in Wilkes book either.
What it does mention in Wilkes's book is that Sheila had admitted to Dr Ferguson that she had been violent towards her children and that she felt capable of murdering them. Now if Jeremy had said this,he'd have been arrested !