Miriam’s Big Fat Adventure (BBC2, 9pm)

MIRIAM Margolyes loves her life, but she hates her body. She’s been “fat” (a word she doesn’t shy away from using) for as long as she can remember, but at 78, she feels the time to do anything about it is running out. However, she’s far from alone as, despite the societal pressure to be thin and the slew of information about healthy diets, the nation is more overweight than ever. So, in this two-part documentary which is showing on consecutive evenings, she’s setting out to learn more about the impact of obesity.

MasterChef (BBC1, 9pm)

SIX more hopefuls arrive at the MasterChef kitchen for the third week of heats, ready to impress John Torode and Gregg Wallace with their signature dishes. The judges’ two favourites will get a coveted apron and a chance to skip the Three Ingredients Challenge, where the remaining cooks have to prove they can come up with a dish that will showcase spring onion, sweetcorn and crab. After that, two will be sent home, leaving the four remaining hopefuls to compete for a quarter-final place.

Liar (STV, 9pm)

FEELING the full force of DI Renton’s investigation, Laura looks to those closest to her for support, but when suspicions fall on Ian, she is left questioning who she can trust. Seeking answers, she turns to a former ally, but the information she gleans only fuels her concerns. In the past, Oliver brings Andrew some devastating news, leading him to make a reckless excursion. Jack and Harry Williams’s thriller stars Joanne Froggatt and Ioan Gruffudd, with Katherine Kelly and Sam Spruell.

Inside No 9 (BBC2, 10pm)

TWO police officers always have time to get to know each other while working on the night shift together. However, PC Thompson’s previous partner died in a brutal attack less than a month previously, the forensic evidence has gone missing and PCSO Varney is beginning to ask a lot of awkward questions. The final instalment of the fifth series of the anthology of darkly comic tales, written by and starring Steve Pemberton and Reece Shearsmith.