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Royal Mail stamp deadline: Everything you need to know as millions to become worthless - Mirror Online
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Royal Mail warns there are only 100 days left to use stamps without barcodes | Royal Mail | The Guardian
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Can I use old stamps? How long you can use non-barcode Royal Mail stamps as King Charles designs rolled out
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1st Class Postage Stamp Queens Head First Class Stamp Pop Art Print England British Postal Poster Queen Elizabeth II - Etsy UK
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Can I still use old stamps? When non-barcode stamps expire in 2023 and how to swap them with Royal Mail
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Can I swap my old-style stamps despite only new barcode ones being valid from 31 July? | This is Money
Are old first class stamps that no longer stick still valid for use, or do you need to pay extra because of the price change? - Quora
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