999: What’s Your Emergency?
9pm, Channel 4
Although it sometimes feels as if there are more people making TV about the emergency services than are employed by them, these shows remain compelling, as evinced by the fact that this one is returning for a fourth series. Among the crimes reported to the dispatchers in Wiltshire in this first episode of the new run are incidents of the modern plague of racist abuse on social media and a report of racist insults between children. Andrew Mueller
Jodi’s Lovely Letters
7.30pm, BBC1
“This is just a little note to remind you how absolutely incredible you are …” For the past four years, 28-year-old Jodi Bickley from Birmingham has been writing personalised letters of hope to depressed strangers – and she won’t stop until she has sent one million. In this inspiring film, Aled Jones meets the One Million Lovely Letters website creator, who has experience of depression herself. “Everyone should know that they are loved,” she says. Ali Catterall
Call the Cleaners
8pm, ITV
Not so much “fly on the wall” as “unidentified brown gunk on the ceiling”, this new six-part documentary series shadows “extreme cleaners” working in the UK. In London, sisters Yvonne and Angela tackle a mouldy, cobwebbed flat while mother-and-daughter team Maxine and Jasmine excavate a hoarder’s grotto. Meanwhile in Somerset, Shaun and his strong-stomached crew get to grips with a gloopy house clearance involving rotting waste. Graeme Virtue
Ripper Street
9pm, BBC2
With many loose ends to tie off, Ripper Street winds up its final series with Susan and Nathaniel behind bars having surrendered themselves to the authorities, and Augustus now in custody (and with a thick lip to boot). But with the lifeless body of young Robin Sumner on the slab, how will Jackson be able to prove a connection between Augustus and his murder? The answer comes sooner than he anticipated, and not with the use of a scalpel, either. Ben Arnold
Diana, Our Mother: Her Life and Legacy
9pm, ITV
Stealing a march on what is bound to be an at-times-morbid frenzy of retrospection come August and the 20th anniversary of Princess Diana’s death, this respectful tribute features the thoughts and reminiscences of the Duke of Cambridge and Prince Harry about their late mother, their last contact with her before the crash and its emotional impact on them. There are also contributions from Elton John, Rihanna and Diana’s brother, Earl Spencer. David Stubbs
The Americans
10pm, ITV Encore
Philip and Elizabeth head from DC to Mississippi in pursuit of Ben and the pest-proof wheat that could revolutionise Russian agriculture. Back in Washington, Paige dives more deeply into the world of her parents and gets to know Gabriel, uncovering his past as a clandestine part of the Jennings clan throughout her lifetime. If nothing else, that her initial reaction has nothing to do with backdated birthday gifts confirms her commitment to the communist cause. Mark Gibbings-Jones
Love Island: The Live Final
9pm, ITV2
After a glorious summer of banter and bonding, ITV2’s hit reaches its, er, climax. It has been a vintage series, with the contestants turning into couples and charming viewers with their saucy antics. But now it’s the final episode and a chance to find out who the public have voted as their favourite twosome, for whom stardom awaits in the form of numerous gossip column appearances and magazine deals. Caroline Flack presides. Hannah Verdier
Film choice
Broken City (Allen Hughes, 2013) 9pm, Film4
A big-star cast – Mark Wahlberg, Russell Crowe, Catherine Zeta-Jones – make this none-too-original Manhattan mystery look better than it is, though it’s watchable enough. Wahlberg’s private investigator Billy Taggart is hired by New York’s Mayor Hostetler (Crowe) to check whether his wife (Zeta-Jones) is cheating on him. Taggart’s inquiries lead into heaps of municipal skulduggery.
Gangs of New York (Martin Scorsese, 2002) 10pm, ITV4
Scorsese’s epic adaptation of Herbert Asbury’s book may not be the classic he intended but it’s a visceral powerhouse of a movie. It is set among rival gangs in the decrepit tenements of 1860s Manhattan, where something like medieval warfare is enacted on Dante Ferretti’s fantastic, monolithic sets. Young chancer Leonardo DiCaprio’s romance with pickpocket Cameron Diaz is puny, but Daniel Day-Lewis’s leering gang chief, Bill the Butcher, is a full-on cinematic monster. Paul Howlett
Live sport
Fencing: World Championships 3pm, Eurosport 2. Coverage of day six in Leipzig, Germany.
Swimming: World Championships 4.30pm, BBC2. Coverage of day two from Danube Arena in Budapest, Hungary, including the men’s 100m breastroke final.
Darts: World Matchplay 7pm, Sky Sports Main Event. Coverage of day three from the Winter Gardens in Blackpool.