42.—(1) The local returning officer shall give to each election agent, or where appointments have been made of a sub-agent, sub-agent not less than 48 hours' notice in writing of each occasion on which a postal voters' ballot box and the envelopes contained in it is to be opened.
(2) Such a notice shall specify—
(a)the time and place at which such an opening is to take place, and
(b)the number of agents the election agent or sub-agent may appoint under paragraph 31(1) to attend each opening.