DOCUMENTARY DNA Family Secrets

BBC2, 9pm

Stacey Dooley (above) and Professor Turi King are back with the series that not only helps people track down their blood heritage, but also looks at its implications for their health. They begin in Liverpool, meeting 52-year-old Richard, whose mother never revealed the identity of his father when she was alive. Plus, Janet, 62, wants to know if she has a half-sister on the Continent. ★★★★★