21.—(1) The weight in kilograms of—
(a)all packaging the producer supplies, where the producer is a seller, online marketplace operator, distributor or service provider;
(b)all packaging the producer discards, where the producer is an importer;
in a relevant year in each nation in the United Kingdom, in each packaging category.
(2) For the purposes of reports submitted in relation to the relevant years 2024, 2025 and 2026, but not in relation to any later years, producers who are—
(a)sellers who supply secondary or tertiary packaging may estimate the amount of packaging which had been supplied to a nation of the United Kingdom in order to calculate the weight of packaging supplied to that nation;
(b)importers who import secondary or tertiary packaging may estimate the amount of packaging discarded in a nation of the United Kingdom in order to calculate the weight of packaging discarded in that nation.
(3) Sub-paragraph (2) does not apply to packaging which is supplied directly by the seller to the person using it.