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First or second class? - The Postal Museum
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Envelope Size Guide
First or second class? - The Postal Museum
Envelope - Wikipedia
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Tim Bingham on Twitter: "My parents who are isolating bought some stamps from @RoyalMail. They were charged £4 for postage. Royal Mail decided to put the stamps in a A5 envelope, place
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PPI Prepaid Envelopes printed from £19. DL+ & C5+ size
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Royal Mail Second Class Large Postage Stamp Sheet, Pack of 50 | Paperstone
