6. In regulation 10, after paragraph (5) insert—
“(6) Without prejudice to the existing obligations, the appropriate authority must ensure that a programmes of measures updated by 22nd December 2015, or subsequently, under paragraph (5)(a)(iii) includes measures for the purpose of aiming to achieve good surface water chemical status by 22nd December 2021 in relation to substances 2, 5, 15, 20, 22, 23 and 28 in the table of priority substances.”.