I think that if JB is innocent we will find that a lot of Julies "evidence" will be found to be there to paint a false picture to actually give JB a motive. don't forget that at a fairly young age he was already a shareholder in two successful businesses was paid a good wage for farming and had free accommodation. It would appear that in fact the "worse " relationship (at the time of the murders) was between Sheila and June and Colin admitted he felt guilty about not handing over the letter to NB that he wrote. Except for hearsay we have no evidence that JB was to be disinherited. Did that in fact come from Colin ? I always thought that came from Julies mother ?
And why did NB tell the estate manager that he was about to give Jeremy more management responsibilities because he was pleased how he was coming on? If Jeremy was really that bad and his relationship with June was as described then he would have chucked him out of the cottage and taken back his business shares for a start.
Jeremy's share of the business was very small so didn't make him happy, he wanted a much larger piece of the pie. He broke in and stole money because he was unhappy with his take. In the meantime there was no way to take the shares back you can't legally give something to someone then take it back against their will you can only take something back if you loan something to someone.
People keep ignoring Jeremy's actions after the murders. He immediately quit the job he had farming. Someone else had to take on his duties. He not only stopped doing his old job he didn't take over as the manager. He had Cock appoint someone else as the temporary boss. He acted like he was a retired playboy after the murders and this corresponds with Julie's claims.
People who support Jeremy completely ignore all of his actions after the murders be it his lies to police at the scene, his bogus claim that the murder weapon could not be stored with the scope and moderator attached, staging too many bullets in the kitchen after the murders, replacing a perfectly functioning phone with the bedroom phone and hiding it claiming it broke then later claiming it was just an extra phone when it was found undamaged, calling Julie before police and lying about who he called first and naturally the fact he stopped working on the farm as soon as they were dead. Excuses are always made about him grieving so that is why he was partying it up and quit working. Never do people who support Jeremy take things at face value there is always some excuses made for him.