Mugford couldn't come forward with her story about Jeremy planning to kill his family, because she overheard him telling Clarke and Jones that two police officers and Jeremy had seen someone moving around in the bedroom, at a time when Jeremy was outside in the grounds, so he could hardly have killed everyone before phoning police - not only that but Jeremy told her that he thought police had shot Sheila when they stormed the building, and that he had complained to a police officer at the scene about the prospect of this having happened...