To leave alleged clues such as a " used " silencer,the the phone-call debacle wasn't exactly a cut and dried plan of Jeremys',somehow. Clues which he'd have known would send him down without a cent having been discussed,so there was no greed on his part.He may as well have stood at the front door of WHF and shouted that he'd done it.
He went the wrong way about things if he thought he was going to come into any money.
Jeremy had no motive whatsoever,but by jove Sheila did I'm afraid.