What’s on TV tonight: Channel 4 takes The Great Climate Fight to Rishi Sunak

Pick of the day: The Great Climate Fight

9.15pm, Channel 4

Kevin McCloud, Hugh Fearnley-Whittingstall and Mary Portas take their climate change fight to the Government to demand change that could mean a greener economy, cheaper energy and lower utility bills. You wish them well because this is, of course, the same Government that recently made sharp U-turn on net zero and rowed back on other climate policies. Anyway, the trio of broadcasters take to the streets and airwaves and meet the businesses and communities who claim they are being held back from going greener by regulations that block the climate fight. Episode two will be available online following this episode.

The Great British Bake Off

8pm, Channel 4

Alison Hammond is sick this week, but “back soon”, according to Noel Fielding. Let’s hope for a speedy recovery because there isn’t much of this year’s competition left. It’s the semi-final, and patisserie week. On the menu are French financiers (“a cake that looks like a gold bar”, says Prue Leith), tarte aux pommes and a mille-feuille showstopper. One baker earns a Hollywood handshake but adds: “I’d like a fist-bump from Prue.”

Louis Theroux Interviews… Joan Collins

9pm, BBC Two

He’s so nosy that I’m not sure I would invite Louis Theroux into my home, but Dame Joan Collins appears relaxed as the interviewer roams at will around her enviable villa in the South of France – including what she calls her “wall of shame” containing framed magazine covers. The 90-year-old acting legend is less relaxed about discussing Donald Trump, but is happy to talk about her marriages, her relationship with sister Jackie and the pre-#MeToo behaviour of movie executives. They are joined by Collins’s current husband, the theatre producer Percy Gibson, who appears admirably laid-back by Theroux’s antics.

Portillo’s Andalucia

9pm, Channel 5

Our man in the colourful trousers visits Córdoba, focusing on the history of different civilisations that have influenced what it is to be Andalucian today, before entering the Mesquita, considered to be one of the world’s greatest Islamic buildings. He also meets a family who use an ancient technique to keep their courtyard cool.

The Australian Wars

9.05pm, BBC Four

After the abolition of slavery in the 1830s, abolitionists in London turned their attention to the plight of indigenous peoples. But Australia was literally on the other side of the planet and the settlers’ interests prevailed. The final part of Rachel Perkins’ fascinating series about this neglected and shameful period looks at “one of the fastest land grabs in history” as the settlers moved into Queensland and South Australia, establishing their own Native Police to “quieten the blacks” in what the Aboriginals remember as “the killing times”.

The Mysterious Career of Lee Harvey Oswald: Timewatch

10.35pm, BBC Four

Within a triple bill of John F Kennedy memorial programming, this 1993 edition of the venerable BBC history slot Timewatch investigates the life story of the man who pulled the trigger. The programme reassesses the psychological, political and forensic evidence of Oswald’s role in the assassination and uncovers previously unseen footage, photographs and witnesses.