D is party to a murder but loses self- control from a qualifying trigger and someone of the same age, sex and circumstance with a normal degree of tolerance might have acted in the same way
Loss of self-control
S54(1)(a), loss of ability to act with considered judgement and normal powers of reasoning - R v Jewell
Suddenness
S54(2), no need for action to be sudden but must convince jury that they remained in a state which they couldn't control (R v Baillie)
Act of revenge
Shown through premeditated, does not amount
Fear trigger
S55(3), D fears seriousviolence against themselves or another identifiable person from V
Anger trigger
S55(4), things said or done which constituted circumstances of an extremely grave character and gave D a justifiable sense of being wronged. (R v Doughty)(R v Zebede)
Incited things said or done
S55(6)(a) If D incited things said or done to provide an excuse to use violence doesn't qualify, Ds fear us discarded
Incited things to justifiable sense of fealing wronged
S55(6)() doesn't amount to qualifying trigger
S55(6)
Can be a combination of fear and anger
Sexual infedelity
S55(6)(c) Cannot be a QT, (R v Dawes, Hatter and Bowyer).
R v Clinton
If other factors included other than sexual infidelity D can still use anger as a QT
Objective test
S54(1)(c), only circumstances that don't affect D's capacity of tolerance and self control can be considered