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The colourful children's characters celebrate their 45th birthday this year, and to mark the occasion, hundreds of Mr Men and Little Miss pieces of memorabilia will be on display at the exhibition designed at a child's scale. Visitors can add their own stamp by uploading an image of their own memorabilia, and the first 45 to do so will receive a limited edition print signed by Adam Hargreaves (the son of Roger Hargreaves who created the original series of books). Add your image to the archive here.