Roald Dahl on 13 September is celebrated as "Roald Dahl Day" in Africa, the United Kingdom and Latin America. In honour of Dahl, the Royal Gibraltar Post Office issued a set of four stamps in 2010 featuring Quentin Blake's original illustrations for four of the children's books written by Dahl during his long career; "The BFG", "The Twits", "Charlie and the Chocolate Factory", and "Matilda". A set of six stamps was issued by Royal Mail in 2012, featuring Blake's illustrations for "Charlie and the Chocolate Factory", "The Twits", "The Witches", "Matilda", "Fantastic Mr Fox", and "James and the Giant Peach". Dahl's influence
Roald Dahl Booktrust and Children's Laureate Michael Rosen inaugurated The Roald Dahl Funny Prize, an annual award to authors of humorous children's fiction. On 14 September 2009 (the day after what would have been Dahl's 93rd birthday) the first blue plaque in his honour was unveiled in Llandaff. Rather than commemorating his place of birth, however, the plaque was erected on the wall of the former sweet shop (and site of "The Great Mouse Plot of 1924") that features in the first part of his autobiography "Boy". It was unveiled by his widow Felicity and son Theo. The anniversary of Dahl's birthday