(1)  A party intending at trial to adduce the oral evidence of a person as an expert witness is to serve on every other party a statement setting out –

(a) the name and address of the witness; and

(b) a description of the qualifications of the witness to give evidence as an expert; and

(c) the substance of the evidence that it is proposed to adduce from the witness as an expert.

(2)  The statement is to be served –

(a) at any time before the trial fixed by order of a judge at the pretrial conference or otherwise; or

(b) if no time is fixed, within a reasonable time before the commencement of the trial.