How long are gb stamps valid for royal mail

According to Royal Mail's guidelines, the validity period for stamps depends on the type of stamp and the destination. Here are some general guidelines:

Standard Stamps:

Special Stamps:

International Reply Coupons (IRCs):

Postage Due Stamps:

Special Cases:

It's always a good idea to check the Royal Mail website or consult with a postal expert if you're unsure about the validity of a specific stamp or the postage requirements for a particular destination.