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It depends what class you're traveling in and what status you have. If you're in First or Business (which BA brands as Club World), or you have any status in BA Executive Club, you can drop your bags from 5am on the day of the flight. Otherwise, bag drop opens 3 hours before departure, or 5am, whichever is later.
BA also offers a bag collection service via ...
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If your bag is handed over by the airport to the lost property office, you will probably be asked to pay an admin fee (£20 or more) to retrieve it - this is certainly the case at most if not all UK airports.
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