'Best Before' dates (not to be confused with 'Use By' dates found on products such as fresh meat and fish) are simply a manufacturers guideline concerned to a products quality.
Often companies like Bluebird and Smiths stamp their products with short dates for commercial reasons rather then any accurate reflection of actual food quality.
We find most goods are perfectly good to eat for many months after.
For more information and any legalities clarification visit the Food Standards Agency website.
Note: We check our stock everyday, so if you see the best before date displayed then that is what you should receive.