Food Unwrapped (Channel 4, 8pm)

ANOTHER selection of favourite investigations from the team. Jimmy Doherty hears about a threat to British juniper berries that could mark the end of gin’s recent resurgence in popularity, while Kate Quilton delves into the contents of herbal bedtime teas to establish if they really can help people get to sleep more easily. Oyster fan Matt Tebbutt wonders why he never finds pearls in his seafood platters so sets off for China, where he discovers that pearl production is full of surprises.

Question Time Special (BBC1, 8.30pm)

THIS is one of the most important weeks in British politics as voters go to the polls. In this edition of the topical debate show, a selected audience of voters under 30 question leading figures from each of the main parties ahead of Thursday’s General Election. The topics will range from the cost of living, to job opportunities, education, housing and Brexit as these young adults try to ensure their needs are not forgotten by the party leaders.

Chris Tarrant: Extreme Railway Journeys (Channel 5, 9pm)

FOR more than 100 years, visitors on the Orient Express ended their journey at Istanbul’s railway station. It’s where Chris begins the latest of his adventures, and it’s a chance to witness one of Turkey’s great engineering triumphs, the Marmaray Rail Tunnel that passes beneath the Bosphorus. Tarrant is surprised by the extremely modern, highspeed train that whisks him along the route of a 2300-mile railway built a century ago by Germans to connect Berlin to the oil fields of Baghdad.

The Case of Sally Challen (BBC2, 9pm)

IN 2010, Surrey mother-of-two Sally Challen bludgeoned her husband Richard to death as he ate lunch at the kitchen table, and was found guilty of murder at her trial in 2011. This documentary follows her appeal against the conviction, with her new defence lawyers arguing she was the victim of Richard’s coercive control.