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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Royal Mail warns there are only 100 days left to use stamps without barcodes | Royal Mail | The Guardian
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There's just ONE DAY left to use non-barcoded Royal Mail 1st and 2nd class stamps – here's what's happening
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Can I swap my old-style stamps despite only new barcode ones being valid from 31 July? | This is Money
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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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