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A recent one-day operation saw environmental campaigners stripping the plastic from their supermarket shopping and leaving it at the stores in protest at excess packaging.

From Strasbourg to Quimper and Le Mans to Hyères customers put purchases into reusable containers before dumping the packaging in trolleys.

Called Plastic Attack, the global campaign aims to highlight plastic pollution saying 8million tonnes ends up in oceans each year. It is asking stores to cut plastic use.

Carre­four said its own-label products would be compliant by 2025.