Coroners and Justice Bill

Can the noble and learned Baroness explain what is complex about this? All the jury needs to decide is, first, whether there has been a murder and secondly, and only if the judge says that there are grounds for justifying extenuating circumstances, whether there are such circumstances. If 10 or more members of the jury say that there are extenuating circumstances, the case will proceed on that basis. If fewer than 10 agree, it will not. That seems perfectly simple to me.