It's probably more about needing an expiary date for selling food.
That's a best before date, not an expiry / use by date.
So technically correct - they probably are better if they are less than a year old.
@sumo
Mr Ts&Cs @tw has said it. A roasting date and a best before of 3-4 months after this would be more accurate. Claiming ludicrous longevity shows a lack of care about the product and the consumer.
@NotThamesWater started
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It's probably more about needing an expiary date for selling food.