She wrote her own books because she couldn't get the S&A books- Guardian obit of Diana Wynne Jones

According to this obituary, Diana Wynne Jones was chastised by Ransome.  And she started writing because her father was rationing the S&A books.

http://www.guardian.co.uk/books/2011/mar/27/diana-wynne-jones-obituary?CMP=twt_gu

"The skinflint father bought the children a complete set of Arthur Ransome books as Christmas presents, but doled them out at a rate of one a year. In self-defence Jones began to write stories for her sisters and herself. When the second world war broke out Jones and her family were evacuated to the Lake District, eventually living in the house once inhabited by the Altounyan children, on whom Ransome had based his Swallows and Amazons series. The great children's author was still around, one day complaining angrily that the children were making too much noise. On another occasion, Diana's younger sister and a friend had their faces slapped by a second Lakeland author who hated children but who was rich and famous because of them: Beatrix Potter. Jones's distinctive scepticism about conventional children's fiction must have started to set in early."