I had these books when I was a little girl (too many years ago to mention!) and was delighted to discovery that they are still in print for my godchildren (only bought with permission from their parents!) One or two american word spellings (mom rather than mum or mother) but a good way to break the ice with delicate conversations about growing up! Always be prepared for more questions though ;-)
I had this book as a child and decided to purchase it for my daughter. It is clear and concise without being ambiguous, and it covers all of the important facts that children should know. It provides a good starting point to discuss adolescence with your children.