Mr Bigstuff

9pm, Sky Max
What’s the best way to follow up the discovery of a major marital betrayal? A slap-up meal at the carvery! That’s where Glen (series creator Ryan Sampson), Kirsty (Harriet Webb) and Lee (Danny Dyer) find themselves in the first episode of this double bill, followed by a revelatory season finale for the unlikely Bafta-winning sitcom. Ellen E Jones

Saving Lives at Sea

8pm, BBC Two
The hard work of lifeboat crews continues to be celebrated in this series, as a 10-year-old boy is stranded at sea on his paddleboard in North Berwick, East Lothian. Elsewhere, off the east Kent coast, a yacht with three people on board has got stuck at Goodwin Sands, which is known as “the ship swallower”. Hollie Richardson

Tom Kerridge Cooks Spain

8.30pm, ITV1
In Andalucía, the chef meets a “wine chemist” who explains the sherry vinegar process. Does Kerridge have the patience to make his own? Then, in Cádiz, the chef learns about the area’s burgeoning avocado business and gets to work in helping to grow them.HR

The Gone

9pm, BBC Two
This New Zealand/Ireland-set crime drama moves slowly at times – Aileen and Derry’s wander through the woods in this episode may try your patience somewhat – but it’s still darkly intriguing. When search-and-rescue teams locate the pair, they think a breakthrough is near. But before long, they have another homicide on their hands. Phil Harrison

The Secret Life of Trees

9pm, Channel 5
It’s the last episode of the Michael Palin-narrated nature series, and he’s poignantly exploring death and renewal. Not only can decaying trees start new life, astonishingly they can “walk” and plant new roots, too. HR

FBI

9pm, Sky Witness
Here’s a seventh season of a straight procedural co-created by Dick Wolf of Law & Order fame. That means pacy storytelling with minimal flair, though the stakes feel big in the new run’s opener, as a car bomb on a New York bridge sends the FBI on a trail that leads to an assassination plot with Iranian involvement – and a departure from the cast. Jack Seale