It's good that there is now support on Sheila having an accomplice.
Previous stances have been terrible. There is no possibility a fully fit Nevill & June would do nothing apart from ring Jeremy. Then a shot Nevill just collapsed in the kitchen & there was no kitchen fight.
Sheila must have been very convincing in persuading her accomplice that her mother, father, brother & sons derseved to die. Espescially as the accomplice would not have been paid.