The following websites may be of interest.

The Fossil Cupboard.
An online discussion forum dedicated to Noel Streatfeild.

Girlsown.
An email list where "passionate fans of schoolgirl stories and series discuss characters, plots, authors, buying and selling, and just about any other aspect of this fascinating genre". Many members are enthusiastic and knowledgable about the works of Noel Streatfeild.

Collecting Books and Magazines
This site focusses on "collecting pre-1970 children's books, story papers and annuals of the last hundred years, movie magazines and almost any other book or series of books".

Noel Streatfeild: If the Shoes Fit...
Brief biography of Noel Streatfeild.

The Noel Streatfeild Page
A list of Noel Streatfeild books.