As soon as practicable after the parcels of referendum voting papers are received by a returning officer, the returning officer must, in the presence of a Justice of the Peace, ascertain the number of—
(a) valid votes cast for each of the options for the question in Part A of the referendum voting paper; and
(b) valid votes cast for each of the options for the question in Part B of that paper; and
(c) informal votes for each Part of that paper.