Lose Weight for Love

(BBC1, 8pm)

SEPARATING overweight couples for ten weeks to slim down sounds a bit drastic until you hear about Pete buying Celena five different bars if she fancies chocolate. As a result the trainee midwife is a good five stones overweight, while Pete is just half a stone behind.

Enter clinical psychologist Professor Tanya Byron and her team who aim to help couples who have become caught up in a cycle of overeating that threatens their relationships as well as their health. By developing new behavioural patterns, the couples can make changes to their lifestyles and their attitudes that will hopefully improve their health and their emotional wellbeing.

In Celena’s case she is soon exercising regularly and resisting carbs, but Pete falls spectacularly off the wagon by downing 15 pints and wolfing down a takeaway. Celena says: “I’m disgusted with myself”. Will she be just as hard on Pete who tries to justify his behaviour at an office party as “a bit of a slip”.

Last week we saw Phil and Becky from Warrington taking the ten-week challenge. They told TV Times that after trying an array of fad diets they were ready to take a new approach to weight-loss. Phil said: "We were a little worried about separating, but it was for the right reasons and if we couldn't spend ten weeks apart for the benefit of both of us, then our relationship wasn't worth anything, was it? I would recommend it to anybody who has tried fad diets because with them you end up so hungry you just want to eat the world."

Celena was driven to halt her weight gain because she felt it was getting in the way of the couple making the most of their lives together - she doesn't want to go on holiday or have their son christened, and is even putting off marrying him until she can shed some pounds. Fitness expert Rick Shakes-Braithwaite starts them on bespoke diet and fitness plans, while Byron tries to find out why Pete keeps feeding the woman he loves, and why Celena seems to struggle to love herself.

Byron does make a breakthrough when she uncovers the source of Pete's hatred of vegetables, so behavioural scientist Professor Paul Dolan steps in to retrain his taste buds with a daily dose of broccoli. But tackling Celena's negative body image may prove to be more of a challenge, and the test of whether or not it has succeeded comes when Byron takes her on a trip to a bridal shop.

Nature's Epic Journeys

(BBC1, regions vary)

THE documentary follows thousands of zebra as they face lions, hunting dogs, drought and starvation to undertake the world's most newly discovered migration. Braving one of Botswana's most brutal wildernesses along the way, the animals make Africa's longest land migration to reach the grasslands of Nxai Pan National Park. Liz Bonnin and a team of scientists and filmmakers use cutting-edge technology to capture the zebra every step of the way, and reveal the secrets behind the brand new finding. Last in the series.

Boris v Dave: The Battle for Europe

(C4, 9pm)

MICHAEL Crick outlines how the ongoing EU Referendum battle between Vote Leave and Britain Stronger in Europe is not only a crusade to determine the UK's future in Europe, but also an intensely personal skirmish between two of Britain's most high-profile politicians. As fellow Tories, former London mayor Boris Johnson and Prime Minister David Cameron are ostensibly allies, but the pair have a long and storied history dating back through their time at Oxford, as members of the exclusive Bullingdon Club, to their shared childhood at Eton. Making use of interviews with both men's friends, family and political foes, Crick sets out to tell the story of their very public duel, which looks set to define both a nation's future, and the leadership of the Conservative Party.

Viv Hardwick