Best of today's TV: Joanna Lumley is going back to her roots

LAST week, Joanna Lumley went back to her Weatherfield roots with a trip to Coronation Street and in this edition, she’s revisiting the New Avengers as she calls in at Eilean Donan Castle, the location for her very first episode. Her journey starts though with her learning more about the Harris Tweed industry in the Outer Hebrides, where she also drives a herd of Highland Cattle. Plus, Joanna crosses to Northern Ireland to visit the Dark Hedges, made famous in Game of Thrones, and to meet one of the Derry Girls.

Alan Carr

Interior Design Master with Alan Carr (BBC2, 8pm)

Judge Michelle Ogundehin splits the remaining contestants into three teams, each of which is given an open-plan office space to transform. The clients are a technology company, a sustainable beauty brand and a media team, and all have similar requirements, needing a work space, a break-out space and a meeting space within the office. However they also have their own styles and preferences, and Michelle will be keeping a look out for the team that best displays their own signature style while also paying attention to the client.

Follow the real crime scene investigators

Forensics: The Real CSI (BBC2, 9pm)

The fascinating documentary series returns, following crime investigators as they use forensics to get to the truth in complicated cases. In this episode, a man from an affluent Birmingham suburb rings 999 to say he has killed his wife. When he is arrested outside his home, he is covered in blood, but during his initial interview, he claims not to remember anything. So, it’s up to crime scene coordinator Jo Ward to lead the search for clues that could establish what happened. Forensic scientist Phil Field goes to the scene to carry out blood-pattern analysis to help create a sequence of events, while the digital experts manage to crack the suspect’s mobile, which offers a new insight into a possible motive.

Anna Friel as Marcella Backland

Marcella (ITV, 9pm)

Leading a double life is never going to be easy, so it’s not surprising that Marcella is struggling as she discovers more clues are being left for her. Can she recall her training and concentrate on being Keira Devlin? Let’s hope so, as the Maguire family are holding a war council, and the main topic of conversation is Bobby. They decide to send him away, and Marcella is in charge of driving him to the airport, but en route, she goes into a fugue… Meanwhile, Katherine takes control back from Alexander Monroe once and for all.

Wellington Arms

First Dates: Valentine’s (C4, 10pm)

It’s Valentine’s Day at the restaurant and Alexandra, who works as a wedding planner, should know all about romance. However, her own love life hasn’t been quite as successful as her clients’ – she describes herself as the ‘Bridget Jones of Northampton’. Can Tom, who also works in the wedding industry, be her own Mark Darcy? Meanwhile, retired politician Roger sits down for dinner with fellow jetsetter Jean, and delivery driver Adam admits that people sometimes think he’s a bit much, but will fun-loving Charlie think he’s just enough?

Alan Yentob hosts Imagine: We’ll Be Back? on BBC1

Imagine: We’ll Be Back? (BBC1, regions vary)

The UK’s performing arts industry can usually be relied on to push boundaries and break new ground _ even in a pandemic. In the latest documentary from the Imagine strand, Alan Yentob finds out how the sector has risen to the challenge, from drive-in opera to innovative, live-streamed theatre performances on our most iconic stages and urgent new work inspired by the Black Lives Matter movement, drawing on footage filmed throughout 2020. But while some shows found a way to go on, Yentob also looks at the grave risks Covid-19 poses to the industry. The companies and venues featured include The Old Vic, Birmingham Royal Ballet, English National Opera and Alexandra Palace, while Carlos Acosta, Tamara Rojo and Vanessa Redgrave are among the people sharing their views.