When I get post from the USA it's usually got interesting postage stamps. When I send mail to the USA, the only £2.80 stamps my post office offers are dull coloured with a portrait of the King. I know that Royal Mail issues commemorative stamps that sometimes include a £2.80 stamp but these never seem to be sold individually in the post office.
How can I buy a small number (ie not the sheet of 30 or 60 from the Royal Mail website) of attractive stamps that show something of the character, history & heritage of this country to my US friends?