An abnormality of mental functioning means a state of mind so different from that of an ordinary human being that a reasonable man would deem it abnormal
Lloyd
Substantial does not mean total nor minimal but somewhere in between and it is for the jury to decide
Di Duca
The CofA held that the immediate effects of alcohol or drugs were not sufficient to amount to an injury for the purposes of diminished responsibility
Dietschmann
If, ignoring the drink, the mental abnormality substantially impairs his mental responsibility he may use the defence
Wood
The D's murder conviction was quashed due to the misdirection, all of the D's drinking doesn't have to be involuntary if the D has ADS
Dowds
His appeal was dismissed. Voluntary acute intoxication, whether from drugs or alcohol, is not capable of forming diminished responsibility
Brennan
If medical evidence confirms the D had an abnormality of mental functioning and this is not contested by the prosecution, the defence should be allowed. His complex personality disorder was an abnormality of mental functioning.