This Order (TCO 0906870) declares that rubber sink/bath plugs (customs tariff heading 4016.99.00) are subject to Part III, Schedule 4 item 50 of the Customs Tariff Act 1995. It was made under s269P of the Customs Act 1901, effective 27 Feb 2009 and operates until revoked under ss269SC or 269SD.
It matters to importers because it changes the tariff treatment of those goods; importers must classify shipments correctly, monitor revocation, and will pay duties (or receive concessions) according to the Schedule 4 item.