Diminished responsibility is only used as a partial defence in murder cases - that reduces the crime to manslaughter if accepted. Don’t think it can be used in his case…I think it’s safe to say the little rat will try to pull the mental health card in his defence. Diminished responsibility on the grounds of insanity. But like someone has already said any psychiatric professional will see straight through his act. A blind man on a galloping horse could see through it.