The relevant part of the directive (UK law) is article 6 (1),
"Member States shall ensure that single-use plastic products listed in Part C of the Annex that have caps and lids made of plastic may be placed on the market only if the caps and lids remain attached to the containers during the products’ intended use stage."
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We were not a member state .
"The new plastic caps are just one in a series of measures being pursued by the EU under the EU Single Use Plastics Directive 2019. Plastic caps must remain attached to the bottle after opening on all beverage bottles, three litres and under, from July 2024 onwards. The aim of the ban is to reduce the amount of litter from bottle caps and increase recycling of plastic bottles.
For the food and beverage industry, the regulation presented new design challenges. Initially the proposal was heavily criticised by the food and beverage industry on the basis of cost and concerns that more plastic would in fact be required. However, the food and beverage industry has adapted. Coca-Cola, for example, has invested in new technologies and redesigned its bottling processes to comply with the new law.
The food and beverage industry will be required to rapidly adapt its packaging again, as by 2025, all plastic bottles sold in the EU must contain at least 25% recycled content, and by 2029, the EU aims to achieve a 90% collection rate for plastic bottles. Although the UK has left the EU, food packaging production takes place on a global scale and therefore we are likely to see this packaging across the UK and UK companies exporting into the EU will be required to comply."