Pyrats is the name of the television show that Shaun watches during the chapter Father and Son. The video can be watched here. It was an animated short developed by 5 French students from the animation school "Gobelins l'école de l'image" in Paris, France. The film was created for the Annecy 2006 international animation festival, created in 7 months, and containing mainly 2D designs as well as some parts enhanced with 3D and Flash.
The official website for the film shot can be found here.