Mechanically, this Order (under s269P of the Customs Act 1901) declares that thermoplastic centralisers for drill‑hole casing and/or tubing (tariff heading 3926.90.90) are subject to Part III, Schedule 4 item 50 of the Customs Tariff Act 1995 from 3 July 2007 until revoked (ss269SC/269SD). It changes the customs‑duty treatment that applies to those imported goods. This affects importers (who may claim the Schedule 4 treatment), customs administration (which enforces classification and any revocation), and commercial sourcing and pricing decisions.