Below are my picks of the most notable shows, returning/premiering on UK screens this week...
★ The White Widow: Searching for Samantha (BBC1, 10.35pm) Documentary on Samantha Lewthwaite, one of the world's most wanted terrorists; a British bomber radicalised by the Al-Shabaab militant group.
Inside Asprey: Luxury by Royal Appointment (ITV, 9pm) New series going behind-the-scenes of the London designer, which famously supplies jewellery to the royal family.
The Secret Life of Students (Channel 4, 10pm) Documentary following 12 students on their first year at Leicester University. (1/4)
★ The Machine Gun & Skye's Band of Brothers (BBC2, 9.30pm) History documentary about the development of the Maxim machine gun, which could fire 666 rounds a minute, and changed the course of the First World War. Presented by Neil Oliver.