The Australian-British sitcom "Austin" returns for a second season on BBC One at 11:10 p.m., continuing the story of its titular character, an autistic young man from Australia. The series follows Austin, portrayed by Michael Theo, as he seeks to reconnect with his estranged father, Julian, a self-centered children’s author played by Ben Miller. Alongside Julian’s wife Ingrid, played by Sally Phillips, the show explores the evolving dynamics within the family. The new season begins with Austin gaining recognition for his successful autistic guidebook to Britain, published to critical acclaim. Meanwhile, Ingrid contemplates her marriage’s future as a revealing DNA test introduces unexpected developments.

On BBC Two at 9 p.m., "Gardeners’ World" features coverage of the Royal Horticultural Society’s latest event, the Badminton Flower Show. Hosts Adam Frost, Rachel De Thame, and Ashley Edwards offer viewers an inside look at the highlights, including the show gardens, young designer features, pocket planting segments, and artisan garden displays. The program continues its tradition of showcasing noteworthy gardening trends and expert insights.

Channel 4’s "Celebrity Gogglebox," airing at 9 p.m., presents a lineup of familiar faces offering commentary on recent television programming. Participants include Vernon Kay and Paddy McGuinness, Denise Van Outen and Johnny Vaughan, Vicky Pattison and Pete Wicks, Bez and Shaun Ryder, Ashley Banjo and Perri Kiely, Rylan and his mother Linda, and Roman and Martin Kemp. The show captures their reactions to various broadcasts from the past week, with an emphasis on entertainment beyond live sports events.

At 9 p.m. on Film4, the action thriller "Plane" features Gerard Butler as Brodie, a former RAF pilot who is forced into a high-stakes emergency landing on a remote island in the Philippines. After the crash, Brodie and the passengers face attacks from local rebels. The situation intensifies as Brodie is joined by Louis, played by Mike Colter, a man suspected of serious crimes who is being extradited but possesses a unique skill set that may prove crucial for survival. The film promises a tense, action-packed narrative centered on survival and unlikely alliances.