World on Fire
9pm, BBC One
Desperation deepens as this excellent ensemble war drama reaches its halfway point. In Germany, Marga’s disturbing fate is realised in an Aryan maternity home. Meanwhile, Lois tends to Harry in Libya, as Stan and Rajib make a dangerous trip across the desert. Back in England, a frustrated Kasia looks for a new way to do her bit, while Robina struggles with looking after her baby granddaughter. Hollie Richardson
Islands
7pm, Sky Nature
On K’gari, an island of sand dunes just off the east coast of Australia, a loggerhead turtle returns to her birthplace to lay her eggs – but the call of the sea means she won’t stay around to see them hatch. Will they be safe from the opportunist dingos that patrol the beach? Elsewhere, in the rainforest, a deadly funnel web spider sets traps on the floor. HR
A Year on Planet Earth
8pm, ITV
As this routinely spectacular series concludes, the nights are drawing in. Autumn is here and the world’s animals are preparing for winter. For bears that means fishing for the final time in the season. For monarch butterflies, a prodigious migration is in prospect. And for penguin chicks, it’s time to take the literal plunge. Phil Harrison
Bomsori Plays Bruch at the Proms
8pm, BBC Four
Violin virtuoso Bomsori makes her Proms debut with a rendition of Bruch’s beloved Concerto No 1 in G minor. It’s part of a lineup that celebrates Hungary’s folk traditions, with the BBC Philharmonic performing Bartók and Brahms under the direction of another Proms first-timer, Anja Bihlmaier. Katie Rosseinsky
A Spy Among Friends
9pm, ITV1
The atmospheric secret agent thriller marbled with fractured flashbacks continues. Stressed defector Kim Philby (Guy Pearce, convincingly louche) is adjusting to the oppressiveness of life in Moscow. Back in London, his hoodwinked pal Nicholas Elliott (Damian Lewis) looks to redeem himself. Graeme Virtue
Our Guy in Colombia
9pm, Channel 4
Climbing on board a drug cartel’s smuggler narco-submarine and going on patrol with the police in Bogotá – which sees up to 400 armed robberies a day – are on Guy Martin’s wild itinerary in this concluding part. He also looks at how the city is winning awards for being one of the most innovative in the world. HR
Film choice
Memento (Christopher Nolan), 11pm, BBC Two
Probably the most perfectly realised of Christopher Nolan’s attempts at nonlinear storytelling, his 2000 mystery starts at the end and works its way back to the start – and is all the more satisfying for the jigsaw puzzle that results. Guy Pearce dials up the intensity as Leonard, who has short-term memory loss but is still determined to solve his wife’s murder. Tattoos of clues he has etched on to his body help, but who can he trust out of the people he meets, and then forgets, including Carrie-Anne Moss (playing against her Matrix type), Joe Pantoliano and Mark Boone Junior? Simon Wardell
Live sport
Formula One: The Belgian Grand Prix, 1.55pm, Sky Sports F1 The 13th round of the season, from Circuit de Spa-Francorchamps.
