PICK OF THE DAY

Dark Heart

9PM, ITV

Written by Chris Lang (who also created Unforgotten), this London-set six-part series – the first two episodes aired as a feature-length pilot on ITV Encore, in 2016 – stars Tom Riley as DI Will Wagstaffe, whose life, both professionally and personally, is shaped by the unsolved murders of his parents when he was a teenager.

This first episode sees him investigating the grisly murder of a man who was once arrested for child abuse, only for the case to collapse due to lack of evidence. Charlotte Riley co-stars as Tom’s sister, Juliette. Continues tomorrow.

Paul O’Grady:

For The Love Of Dogs

8PM, ITV

Paul O’Grady returns for a new, eight-part series following the stories of some of the animals at Battersea Dogs & Cats Home. This week, he meets a dachshund and her adorable puppies, thought to have escaped from a puppy farm. Will Paul be able to resist adding one to his menagerie?

The Secret Life Of The Zoo

8PM, CH4

The series going behind the scenes to meet staff and residents of Chester Zoo returns for a new run. In this first episode, keepers fear that 37-year-old elephant Thi, pregnant with her ninth baby, is three months overdue. Plus, how will widowed female anteater Bliss react when toyboy Oso arrives at the zoo?

Grand Designs

9PM, CH4

Kevin McCabe is the leading living exponent of the ancient art of building with cob, a mixture of clay, sand, straw and water. When Kevin McCloud first met him in 2011, his dream was to build a cob castle in Devon with his bare hands. Here, Kevin revisits his namesake to find out whether he has achieved his goal.