999: What’s Your Emergency? (C4, 9pm)

THIS series exploring the reality of life for the men and women on the frontline returns with a look at how many town centres are now at risk of becoming no-go areas, and according to Northamptonshire PC Sean Whelan, street drinkers are increasingly filling the void where stores used to be. Many councils hope that a switch from the daytime economy of shopping to a night-time economy of bars, restaurants and clubs will allow the high streets to thrive again but this also puts more pressure on the already overstretched police force.

Silent Witness (BBC One, 9pm)

THE body of a woman is found on train tracks in London, badly damaged from electrical burns. On the mortuary slab, the woman’s recent and historic injuries suggest years of abuse, likely within the home. It is a difficult post-mortem for Nikki, as it stirs up troubling memories from her childhood. First of a two-part episode of the long-running crime drama following the work of the Lyell Centre’s team of forensic pathology experts, starring Emilia Fox, David Caves, Richard Lintern and Liz Carr.

Cold Feet (STV, 9pm)

ADAM and Karen’s new living arrangements cause chaos for the family when an unexpected visitor tips them over the edge. Elsewhere, David embraces his new role, but faces humiliation from a former adversary, while Pete’s time on a jury has unexpected consequences for Adam. John Thomson, James Nesbitt, Fay Ripley, Hermione Norris and Robert Bathurst star in Mike Bullen’s long-running, award-winning comedy drama.

Diamond Dealers and Cockney Geezers (C4, 10pm)

DOCUMENTARY going behind the scenes at Trotters Jewellers in Bethnal Green in London’s East End, a family-run business the ownership of which has recently passed to 26-year-old Judd, who manages with old schoolmates Alex and Kallum. The film shows the team designing a commemorative piece for a current world champion boxer, while a bricklayer splashes out on a £9000 watch, a man buys a diamond necklace to say sorry.