I designed these as giveaways at conventions when we were pitching swag for MK. I have shared the front pictures before: the foreground kids are mine, whereas the silhouetted adults were drawn by artist Jordi March, who was also the photographer for the story on the Pennaquick Telegraph in the book.
Each model included a different quote from the depicted character on the back.
A fifth bookmark contains the rules for Word Bluff, the official Blyton Summer Detective Club car trip game. Try it at home!