The last paragraph is interesting.
It is no secret that Bamber hated his family. He also resented Sheila's subsidised living in London, together with the twins who were set to inherited as much as Bamber. Perhaps more, Mary Mugford testified that Bamber said June was thinking about changing her wills.
Neville & June were old, June insane. Sheila was a nutter. Why should these people stop me getting what I want ? Now it is a case of why should these inferior people be keeping me jail ?