Yeah...
Lets talk about a key police officer changing his story - PI "Bob" Miller, was supposedly accompanying the police surgeon around the bedroom at 8:44am, when Sheila's body was found on the far side of the bed, with a single wound on her neck, but it turns out that Miller did not arrive at the scene along with DS "Stan" Jones, until 9:14am...
Miller and Jones, do not get shown around house until 9:33am, so it can now be established that Sheila still only had a single wound to her neck at this (9:33am)...