I'm not sure if it is a new clause or this one from 2019:
“No defence for consent
(1) If, in the course of any behaviour which constitutes domestic abuse within the meaning of this Act, a person (“A”) wounds or assaults another person (“B”) causing actual bodily harm, more serious injury or death, it is not a defence to a prosecution that B consented to the infliction of injury.
(2) Subsection (1) applies whether or not the actual bodily harm, more serious injury or death occurred in the course of a sadomasochistic encounter.”
“Consent of Director of Public Prosecutions
(1) In any homicide case in which all or any of the injuries involved in the death, whether or not they are the proximate cause of it, were inflicted in the course of domestic abuse, the Crown Prosecution Service may not, in respect of the death—
(a) charge a person with manslaughter or any other offence less than the charge of murder, or
(b) accept a plea of guilty to manslaughter or any other lesser offence without the consent of the Director of Public Prosecutions.
(2) Before deciding whether or not to give consent for the purposes of subsection (1), the Director of Public Prosecutions must consult the immediate family of the deceased.”
publications.parliament.uk/pa/bills/cbill/2017-2019/0422/amend/domestic_rm_pbc_1007.1-3.html