Found in section 54 of the Coroners and Justice Act 2009.
Defendant must kill as a result of loss of control through their acts or omissions. The loss of control must be caused by a recognised qualifying trigger and a person of the defendant'ssex and age would have reacted in the same way in that situation.
Qualifying trigger can be fear of violence (R v Lodge) - subjective test, or things said or done which are of grave character that must have made the defendant feel ‘seriously wronged’.
(R v Zebedee) - dad soiling himself is not classed as ‘extremely grave’, and that the defendant should not have felt seriously wronged.
(R v Hatter) - shows that a breakup is not classed as ‘extremely grave’, and that the defendant should not have felt seriously wronged.
(R v Clinton) - sexual infidelity (affairs) are disregarded as a trigger unless other triggers are present.