19.—(1) Any party may submit to a Commissioner written observations in reply within one month of being sent written observations under regulation 18.
(2) The office shall send a copy of any written observations in reply to every other party.
(3) Where—
(a)written observations have been received from the respondent under regulation 18; and
(b)each of the principal parties expresses the view that the decision appealed against was erroneous in point of law,
a Commissioner may make an order under Article 15(7) of the Order setting aside the decision and may dispense with the procedure in paragraphs (1) and (2).