Does anybody remember the title of an Enid Blyton book about a group children who hide out and live on island to escape their horrible aunt uncle?

In this book, four children, Philip, Dinah, Jack, and Lucy, run away from their cruel Aunt and Uncle and find refuge on a secluded island. They build a secret hideaway and have many exciting adventures, encountering pirates, smugglers, and other dangers.

Is that the book you were thinking of?