He's best known for his collaborations with authors like:
* Jacqueline Wilson: Sharratt has illustrated many of Wilson's books, including the Tracy Beaker series.
* Anne Fine: Their collaborations include "Flour Babies" and "The Tulip Tree."
* Julia Donaldson: They've worked together on books like "The Gruffalo."
However, he has also illustrated countless other books on his own, in addition to his well-known partnerships.
Therefore, there's no official count available for the total number of books he has illustrated.