TV tonight: Monty Don says goodbye to Gardeners’ World after two decades

8pm, BBC Two
After more than two decades of planting, hedging and harvesting, it’s finally time for Monty Don to hang up his trowel. Expect his final episode to have a bittersweet tone. However, gardening waits for no man: as Carol and Joe prove, from sowing to apple gathering, there’s always work to be done. PH

Return to Paradise

7.30pm, BBC One
“My name is Viktor Sevchenko. I am an artist. And today, I die.” And with that, he’s stabbed through the heart in a grisly piece of performance art at Dolphin Cove art fair. But was his death a tragic accident? And why is he clutching a jelly baby? Mack (Anna Samson) investigates, kicking off an Australia-set season three double bill. Ali Catterall

Unreported World: South Africa’s Whistleblower Hitmen

7.30pm, Channel 4
An incredibly sinister story from South Africa: Darshna Soni explores the use of contract killers to silence whistleblowers, often including those making accusations of malfeasance connected to controversial government contracts. Soni speaks to a former hitman and to families who have lost loved ones. PH

The Walking Dead: Dead City

9pm, Sky One
As season three of the lurid zombie spin-off reaches its finale, former drinking buddies Dillard and Negan are on a collision course. Can a squirrelly dive-bar habitue really summon enough main character energy to take down one of the show’s most notorious villains? Graeme Virtue

War

9pm, Sky Atlantic

A courtroom showdown looms as this delightfully juicy divorce drama approaches its endgame. And with Taylor and Byrne’s case looking increasingly shaky, Molly smells a rat. Is Johnny’s world about to come crashing down (again)? Dominic West and Sienna Miller are excellent, charismatic twin leads. Phil Harrison

The Graham Norton Show

10.40pm, BBC One
Graham welcomes Judi Dench (punting a memoir), Alan Cumming (returning to the stage) and Nicola Coughlan (promoting a new drama) into his inner circle. Music, and maybe a little Celebrity Traitors gossip, comes from James Blunt. PH

Film choice

Possible Love (Lee Chang-dong, 2026), Netflix

In Korean director Lee Chang-dong’s involving, edgy drama, documentary-maker Ye-ji (Cho Yeo-jeong) is attempting to make a film about factory workers sacked after a strike was violently broken by the state. She is particularly intrigued by the sullen, possibly traumatised Ho-seok (Sul Kyung-gu). He is resistant but Ye-ji develops a bond with his enthusiastic wife, Jeon Do-yeon’s Mi-ok. As the parties get to know each other, with the addition of Ye-ji’s wealthy spouse, Sang-woo (Zo In-sung), uncomfortable questions of class and exploitation swirl around them. Just as in his last film, 2018’s Burning, Chang-dong has a sharp eye for what’s hidden behind everyday lives. Simon Wardell

Live sport

Nations Championship rugby: Ireland v Argentina 7.15pm, ITV1. From the Aviva Stadium, Dublin.