Know where your old stamps are?
Royal Mail have added barcodes to their regular stamps. Regular stamps without a barcode will no longer be valid after 31 July 2023. This follows the introduction of a 6 month grace period from the initial 31 January deadline. You can either use up your non-barcoded stamps before this new deadline or swap them for the new barcoded ones.
The stamps that have changed are the stamps that will be very familiar to you. They feature the profile of Her Late Majesty The Queen on a plain coloured background.