The Secret Life of the Zoo, C4, 8pm

AS the series draws to a close, young Asian elephants Aayu and Nandita fall seriously ill. Soon blood tests confirm that they have contracted the elephant herpes virus, so the keepers use anti-viral medication and a pioneering blood transfusion. But will the blood plasma taken from their father Aung Bo save them? Meanwhile when rare silvery gibbons Alven and Tilu have a new baby, dad Alven must keep their older son Eko in check. Plus, at the insect house, a new species, the dragon-headed katydids, arrives. Keepers hope to mate female Beryl with one of two males, but which one will win her over and ensure the future of this extraordinary-looking insect at Chester?

Fred and Rose West: The Real Story with Trevor McDonald, STV, 9pm

THE crimes of Gloucester couple Fred and Rosemary West were so heinous that they appalled and transfixed the world. “Coming back to this story 25 years later, it’s still as shocking as it ever was, if not more so,” says Sir Trevor McDonald, the host of this brand-new and powerful documentary. Made a quarter of a century on from the horrifying discoveries in the “House of Horrors” – dismembered female bodies in the basement and under the patio, the film features exclusive interviews and insights.

Sleeping with the Far Right, C4, 9pm

JACK Sen is a self-styled spin doctor for the nationalist movement and manages websites and social media groups to promote his own beliefs and those of prominent figures in the far right. Alice Levine sets out to discover why he holds the beliefs he does by spending a week in Jack’s home, hoping to find out how his world view shapes his family’s everyday life. She also follows Jack as he attends events and activities connected to his beliefs, and speaks to a number of his associates, who are prominent nationalist figures. But having spent seven days in his company, how will Alice feel about her new acquaintance?