Sport Relief 2020 (BBC1, 7pm)

HAS it really been two years since the last sporting fundraiser? Here’s a chance to dig deep once more as celebs reveal how they have been doing their bit for assorted worthy causes. Viewers of The One Show will already have glimpsed the likes of Louise Minchin, Nick Grimshaw and Samantha Womack being pushed to their limits in unbearable heat. Expect an update on their joint Namibia venture. The night’s hosts include Gary Lineker, Paddy McGuinness as well as some new faces for 2020.

How Healthy Is Your Gut? (C4, 8pm)

WITH digestive problems costing British business billions of pounds each year, there’s little wonder programme-makers decided to address the issue. In this one-off documentary, Sabrina Grant explores why the gut is so important to our overall well-being and how it affects everything from our moods and energy, to sleep and health. With the aid of six volunteers, all with a typical abdomen complaint, Sabrina puts some of the most popular regimes to the test and sees whether they actually work.

The Yorkshire Steam Railway: All Aboard (C5, 8pm)

THE August bank holiday coincides with a heatwave and in the old carriage kitchen, Sammie swelters

with 100 meals to prepare and serve, while on the loco footplates the boiler kicks out an extra 1,000 degrees of heat. A trackside wall collapse threatens to stop the railway in its tracks, but a curious group of volunteers called the Wombles comes to the rescue, Piglet comes up with a moneyspinner by sending one of the locos to another railway.

Celebrity Britain by Barge: Then & Now (C5, 9pm)

BILL Oddie, Jennie Bond, Anne Diamond and Pete Waterman head to Northamptonshire to navigate the mighty Grand Union Canal, at one time the busiest waterway on the network and the vital transport link between Birmingham and London. Travelling from north of Milton Keynes to the old canal port of Braunston, they celebrate the “boat people”, who once lived and worked on canals. Travelling through a dark and deadly tunnel at Weedon Bec, they also visit what was once a secret arms store.