PICK OF THE WEEK TV extra Prue and Paul on a roll as baking competition returns

Leanne is keen to launch her own beauty product range and is furious to discover Bel had the same idea years ago, but Shameen helps her spot a gap in the market. Dante confesses a guilty secret to Tyler, who is so shocked that he finishes with him, while a fire breaks out in the salon, forcing Leanne to come up with a way to ensure that MirrorBel Beauty can continue to treat their clients – while trying to get to the bottom of who deliberately started it.

The Joy of Winning (BBC4, 9pm)

Did you know that maths could help you to avoid everything from nuclear annihilation to listening to the kids arguing in the back of the car during a long road trip? It’s all linked to game theory and, in this documentary, mathematician Dr Hannah Fry will be using it to unlock the strategies you need to get what you want. In the process, she reveals the link between rapper Ludacris, a Kentucky sherriff, a Nobel Prize winner and doping in professional cycling and, even more impressively, explains the science behind the TV series Golden Balls.

An extraordinary double search within one family, beginning as sister Maureen looks for her brother Keith to tell him the truth about their father, followed by a further search with Keith to find out more about the birth mother he never knew. Keith now lives in Australia, but the news that Maureen is looking for him and the information she brings about their father is life-changing for him, causing him to travel back to his childhood home in Wales and dig deeper into his past.

With GP surgeries now facing unprecedented pressures and receiving less than 10 per cent of the total NHS budget while handling 90 per cent of its workload, how long can this vital community service last in its current form? This landmark documentary series continues to find out as it moves to the Ridge Medical Practice in Bradford for its latest run. Dr Hafeez is treating Sarah, who is suffering from a shocking case of chicken pox that has covered her body in large and painful spots.

The latest run of Eat Well for Less? ended a few weeks ago, but Alex Jones and Steph McGovern are here to fill the gap with this sister show. The first episode finds them heading to Caerphilly to meet the Ingram family, who are struggling to cope financially after having two sets of twins in less than two years. Parents Liam and Emma’s desire for big-name brands is also crippling their finances, so in an effort to get their spending down, the family’s budget-blowing belongings are replaced with alternatives disguised in plain packaging.

Upstart Crow (BBC2, 8.30pm)

Will is just finishing writing A Midsummer Night’s Dream, a tale of love potions, enchantment and a wood full of fairies. He’s very pleased with how realistic it is as he based it on his own experience, but Burbage and the other actors tell him it lacks a little comedy.

BOTH Leith, who replaced Mary Berry when the show started on Channel 4, and Hollywood – a judge since its launch – admit they felt more relaxed filming this series, the second since the move from BBC1.

“I suppose although I didn’t think I was nervous last time, I must have been a bit more tense than I thought,” notes Leith, who started her career in the 1960s with her catering company, Leith’s Good Food.

“Prue was off and running, there was no problem really last year and this year felt even easier, to be honest,” says 52-year-old Hollywood, a former head baker at a number of hotels.

“Noel and Sandi do an amazing job as well. It just made the whole filming process this year so relaxed and laidback, and actually it’s the most relaxed I think

In a radical experiment, pioneering scientists from across Europe have come together to use new technology to explore what our world would look like if we could not tell lies. Three British contributors are rigged to make it impossible for them to lie undetected and are challenged to live for a whole week without telling a single lie. This bold social experiment sets out to discover the role of deception in our lives and to investigate the impact lying has on our mental state and the consequences of it for our relationships.

Jean Johansson, John Partridge, Spencer

In June, Victoria Pendleton hit the headlines when she announced she was suffering from depression brought on by oxygen deprivation during an