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Sainsbury's expects the impact of lowering prices to be relatively small.

For instance, Neodymium is used to make the powerful magnets used in loudspeakers, computer hard drives, EV motors and jet engines that enable them to be smaller and more efficient.

So, if only the smallest percentage of China's retirees take a silver train, it can still mean millions of ticket sales.

Experts say this is a common method, often with the guns transported in multiple shipments of small quantities, a process named "ant trafficking".

The last of these happened last year to David Davila, who is part of the marketing team at Quantum Windows & Doors, a small, family-run business based in Washington state in the US.