What was the first story book title published by Puffin Books after it was set up by Penguin Books in 1940?

Question

Which book was published in 2015 but written before, and seen as a preliminary to, the author's only other book, a prize-winning work published in 1960?

Answer 1

Worzel Gummidge
The other titles were also published by Puffin, with 29 others, over the first eight years.