Unreported World, C4, 7.30pm
KRISHNAN Guru-Murthy heads to the northern coast of South America to report on the plight of some of the one million children in Venezuela caught up in what is believed to be the world’s biggest migration as they flee poverty, hunger and medical shortages. With director-cameraman Nick Blakemore, the journalist joins the youngsters as

they make the dangerous crossing into neighbouring Colombia, where even then they have to fend for themselves, with no money and nowhere to stay.

The Great Model Railway Challenge, C5, 8pm
THE Wakefield RMS, Aberdeen Model Railway Club and pan-European entertainers Shunter Guys compete for a place in the final by creating railway layouts based on the fiendishly difficult theme “waterworld”. Standing between the teams and the final are judges Steve Flint, editor of the UK’s leading railway magazine Railway Modeller, and renowned master modeller and modelling vlogger Kathy Millatt. Presenters James Richardson and Tim Shaw oversee proceedings.

Made in Great Britain, BBC2, 9pm
FOR years chocoholics have flocked to York’s Chocolate Story, a museum which illustrates how one of Blighty’s most visited regions was responsible for transforming a luxury drink for the rich into the nation’s favourite treat. For those who haven’t had the pleasure a) a shame as the DIY choc lollies are phenomenal and b) fear not as presenter Steph McGovern and Yorkshire chocolatier Paul Young present their version of that story.

Unbelievable Moments Caught on Camera, STV, 9pm
ALASTAIR Stewart presents extraordinary eyewitness footage filmed by members of the public, including how a pod of hungry killer whales had its hopes dashed when a plucky young seal seized a life-saving opportunity when a tourist boat of whale watchers sailed close by. Plus, the gripping journey a group of sightseeing friends from Boise, Idaho, made when a miscalculation in the air density caused its small aircraft to crash into woodlands shortly after take-off. And the inspirational story of an adventurous Isle of Wight resident who took to the skies in a sponsored tandem skydive for charity – at the grand old age of 91.