Animal lover Sue Perkins travels to America to meet a group of newly retired female chimpanzees at Chimp Haven, the US national chimpanzee sanctuary. After a recent change in US law, decades of medical testing on chimpanzees has been brought to an end and cameras follow as Jill, Whitney, Paula-Jean, Tessa, Martha and Ariah settle in to the sanctuary after an 800-mile journey from a laboratory in New Mexico to... see more