A pity the second episode cut short Stan Jones upstairs at WHF. Trying to work out how Sheila could have done it.
Surely Taff was not as bad as being made out. However EP should have tried to do a detailed reconstruction of how Sheila committed the massacre. Based on the crime scene evidence. They would have realised Sheila could not have done it.
They should have also checked the windows in more detail. To see if any could be secured from outside. Which would not be unusual.
Nevill calling Jeremy is also totally daft.