Don Estelle was a popular British actor and singer, not an author. He is best known for his roles in the sitcoms "It Ain't Half Hot Mum" and "Bless This House". He also had a successful singing career, with popular songs like "Whispering Grass" and "The Sunshine of Your Smile".
You may be thinking of another person with a similar name. If you could provide more information about the author you are looking for, I may be able to assist you further.