Is this stamp valid for a small letter? : r/royalmail

When do stamps expire? Date old stamps are no longer valid and Christmas posting dates

Royal Mail urges people to use or swap non-barcoded stamps, Saving money

Buyer has paid royal mail £5 because I didn't pay - UK Community

Royal Mail warns there are only 100 days left to use stamps without barcodes, Royal Mail

Royal Mail urges people to use or swap non-barcoded stamps, Saving money

Writing Postage Prices on Postcards/Letters? - Mail, stamps & postal info - Postcrossing Community

Does this envelope need a stamp? : r/royalmail

Royal mail stamps : r/CasualUK

Wondering if these stamps are fake : r/royalmail