R v Kemp
Physical cause
R v Sullivan
Didn’t matter if it wasn’t permanent as long as it happened during.
R v Hennessy
Diabetes internal cause, no insulin.
R v Quick
External cause not insanity
R v Burgees
Sleepwalking internal, sleep disorder.
R v Windle
Aware he was legally wrong, cannot use insanity
R v Clarke
Cannot merely be absent mindedness or confusion.