15.—(1) The constituency returning officer shall give 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, to–
(a)each candidate for return as a constituency member; and
(b)except in each case of an election to fill a vacancy in the seat of a constituency member, each individual candidate for return as a regional member and the election agent for each registered party standing nominated.
(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 a candidate may appoint under paragraph 5(3) to attend each opening.