An offender must not be shot without first considering (summarised)
Communication
They must have been first asked to surrender (unless it is impracticable to do so)
Less violent alternative (Proportionality)
It must be clear that the offender cannot be disarmed or apprehended without first being shot
Delay (Necessity)
It must be clear that further delay in apprehending the offender would be dangerous or impractical
Police must only use a firearm for these lawful purposes (summarised)…
S48 if -
S39 if -
S40 if -