Paragraph 10 Conduct of proceedings and witnesses
The parties to the arbitration shall within twenty-eight days of the appointment of the arbiter deliver to him a statement of their respective cases with all necessary particulars; and—
(a)
no amendment or addition to the statement or particulars delivered shall be allowed after the expiry of the said twenty-eight days except with the consent of the arbiter;
(b)
a party to the arbitration shall be confined at the hearing to the matters alleged in the statement and particulars delivered by him and any amendment or addition duly made.