It is a complete defence as the AR committed was not voluntary, there is an external cause
Quick
There is no fault when the D was in an automatic state through an external cause
Hill
There has to be a total loss of voluntary control
AG's reference1993, R v T
If automatism happens due to the D' s voluntary conduct, intoxication rules apply
Coley, McGhee
If the automative state results from an improper action or failure by the D, it will e a defence to specific intent
Hardie
It will not e a defence to a basic intent offence if they know the risk that if they did become an automaton, they might engage in dangerous/agressive conduct