The Guest
9pm, BBC One
A moreish Welsh crime thriller that will have you screaming at the screen. Ria (Gabrielle Creevy) is a cleaner who wants more from life; Fran (Eve Myles) is the enigmatic businesswoman who hires her. Suspicions are raised immediately when Fran seems keen to overstep the employer line and encourage Ria to make some big changes. Then a shocking accident happens and their relationship becomes twistier and darker. Hollie Richardson
Panorama: The £170 Million Diamond Scam
8pm, BBC One
An investigation into the mystery of the “vanishing” diamond dealer Vashi Domínguez. After securing £170m from investors for his luxury jewellery stores, his business went bust last year – and he was gone, along with the cash and most of the stock of diamonds. Richard Bilton unravels what was really happening. HR
Disaster at Sea: The Piper Alpha Story
9pm, BBC Two
A superb documentary series with the conclusion of intense inquiry testimonies from survivors of the fire on board a North Sea oil rig in 1988. As some families receive the worst possible news, attention turns to a search for answers and justice – a process that will not prove straightforward. Jack Seale
I Am Martin Parr
9pm, BBC Four
“I like to understand what people are like just by looking at them.” Martin Parr is one of Britain’s most beloved photographers, and his work and life are celebrated in Lee Shulman’s film that follows Parr on a road trip. Artist Grayson Perry, fellow photographer Bruce Gilden and others help to explain exactly how sharp his eye for the culture of British society is. HR
Stacey Dooley Sleeps Over
9pm, U&W
Dooley’s take on the When Louis Met … format is both accessible and frequently eye-opening. This week, she meets Barrie Drewitt-Barlow, Britain’s first legally recognised gay dad, who is now a passionate advocate for paid surrogacy (which remains illegal in the UK). Hannah J Davies
Elsbeth
9pm, Sky Witness
This week’s guest murderer is St Denis Medical standout David Alan Grier, here dealing with adverse health outcomes as an imperious undertaker. But, when he bumps off his conspiracy theorist nephew, it brings him into the orbit of Elsbeth (Carrie Preston), the Columbo-style sleuth who relishes digging up the truth. Graeme Virtue
