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4.—(1) If it appears requisite to a billing authority that a demand notice should be served in Welsh and in English, instead of in English or in Welsh, it shall be so served.
(2) If it appears requisite to a billing authority, it shall provide a Welsh translation of a demand notice served in English.
(3) If it appears requisite to a billing authority, it shall provide an English translation of a demand notice served in Welsh.