20   Notice—evidence of substantial mental impairment

For the purposes of section 151 (1) of the Act, notice of an accused person’s intention to adduce evidence of substantial mental impairment at his or her trial for murder:

(a)  must be in Form 1, and

(b)  must be given to the Director of Public Prosecutions at least 35 days before the date on which the trial is listed to commence.