53.—(1) The local returning officer must open separately each ballot paper envelope placed in the receptacle for ballot paper envelopes.
(2) The local returning officer must—
(a)place in the postal ballot box any ballot paper the number on which is the same as the number (or one of the numbers) on the ballot paper envelope,
(b)place in the receptacle for rejected votes any other ballot paper which must be marked “provisionally rejected” and to which the ballot paper envelope is to be attached, and
(c)place in the receptacle for rejected ballot paper envelopes any ballot paper envelope which must be marked “provisionally rejected” because it does not contain either a ballot paper or, where more than one number appears on the ballot paper envelope, a sufficient number of ballot papers (and indicating in each case the missing ballot papers).