6. In regulation 13 (sampling: water supplied by tanker)—
(a)in paragraph (1), for sub-paragraphs (a) and (b) substitute—
“(a)when the water is put into that tanker,
(b)24 hours after the commencement of the distribution from that tanker, and
(c)every 24 hours from then on until the distribution is discontinued.”,
(b)after paragraph (3), insert—
“(4) This regulation does not apply where the distribution of water in any part of a water supply zone is by mobile tanker.”.