TV tonight: Inside a famous potato factory – and its controversial new flavours television

Dismantling Walkers: Inside the Crisp Factory

8pm on Channel 4
Hot honey chips, anyone? The controversial new flavor is one of a few launched as part of Walkers’ rebranding. In this program – which verges on being an infomercial – cameras are invited to watch the birth of potato chips from soil to shelf, and to go into the kitchen to learn how flavors like chicken masala and sticky teriyaki are invented. Holly Richardson

Death in heaven

9pm, BBC One
The death of a kindly elderly lady at the close-knit St. Mary’s Church run by Officer Sebastian’s mother is initially presented as an unfortunate accident. But the circumstances are mysterious enough that bucket-hat-wearing Detective Mervin suspects foul play, sending the normally laid-back Seb into an emotional tailspin. Graeme Virtue

Under the salt marsh

9pm, Sky Atlantic
This crime drama set in overcast Wales has a fascinating appeal: a looming weather front that will literally remove evidence of many evil deeds. But what really elevates the film are the tense performances from Kelly Reilly and Rafe Spall as the two sullenly determined leads. Can they catch a break before the storm hits Alec? JV

The last leg

At 10pm on Channel 4
Adam Hills, Josh Widdicombe and Alex Brooker return for the 34th series of this BAFTA award-winning show, which wears its politics lightly and maintains a fine balance between current affairs analysis and goofy comedy. They are joined this week by Bridget Christie, Aisling Bea and Chloe Bates. Phil Harrison

The Graham Norton Show

10.40pm, on BBC One
Another lively week on the sofa with Graham. Joining him this time are Benicio del Toro, who will ponder the Oscar possibilities in Battle After Battle, Jennifer Garner, who returns to our screens in The Last Thing He Told Me, buzzy chef Gordon Ramsay, and reformed brat Charlie xcx. Foo fighters bring the noise. pH

Masked Devil: John Wayne Gacy

At 10.45pm on ITV1
The gripping American drama based on true events continues, as serial killer Gacy (Michael Chernos) troubles his latest detective. Meanwhile, more conscientious cops expose the culture of complacency and homophobia in the police that allowed Gacy to remain at large for so long. Jack Seale

Choose a movie

I know what you did last summer (Jennifer Keaten Robinson, 2025), 7.50am, 8pm, Sky Cinema Premiere
What did he do? You Do last summer? If that doesn’t include a reboot of this slasher series, you’re missing out on a fun mix of ’90s nostalgia (Freddie Prinze Jr and Jennifer Love Hewitt reprise their roles) and Gen Zrip (the studio’s Chase Sui Wonders and It Girl Gabbriette head up the new cast). It’s been 27 years since wayward youth in Southport, North Carolina were first held accountable for their vulnerable neglect — RIP Miss Sarah Michelle Gellar — and now the Hook Hunter is back. Ellen E. Jones

Live sports

Prem Rugby Cup: Gloucester vs Sale, 7.30pm on TNT Sports 1
Pool match coverage from Kingsholm.