Sell by - This is the date imposed upon retailers, anything with this has to be sold by the date indicated. Anything past this date is still fine, but not maximum quality.
Best before - Similar to the above, but retailers may sell these as reduced prices. Past this date is still usable for days/weeks depending on the product.
Use by - A date for both retailers and consumers. Must be used by this date, and is so important that any retailer with any of these found past the date on their shelves get fined £5000 per item.
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