Secrets of the National Trust with Alan Titchmarsh, C5, 9pm

THIS time, the presenter visits Mount Stewart on the shores of Strangford Lough in Northern Ireland, which was home to the Stewart family for more than 250 years. They were given the title of Marquess of Londonderry and it was the Marchioness, Lady Edith, who was largely responsible for transforming the house. Titchmarsh learns about her eclectic taste as he looks around her private bedroom suite, and meets her granddaughter, Lady Rose. Elsewhere, Nina travels to the Peroni Archive in Belfast to discover Lady Edith was a suffragist.

CelebAbility, ITV2, 10pm

IS Iain Stirling on a mission to take over ITV2? His narration is a big part of what makes Love Island so addictive, and he’s also hosting this game show. For newcomers, it sees groups of five friends take on five celebrities in challenges based on what the famous faces claim are their hidden talents. This week’s celebs are Ollie Locke, Duncan James, Olivia Attwood, Vanessa White and Scott Mills, who, judging by his time on Strictly Come Dancing, won’t be claiming the samba as his special skill.

Mortimer & Whitehouse: Gone Fishing, BBC2, 10pm

CAMERAS follow old friends Paul Whitehouse and Bob Mortimer as they continue their angling trip round the UK. This time, Paul and Bob fish the river Wensum in Norfolk for Roach, but as the pair struggle up and down the riverbanks, they begin to realise age is starting to take its toll on their physicality. After staying overnight in a disused train station and visiting a pub, they challenge each other to a fishing competition the following day, in which the winner gets a very special culinary treat.

Stath Lets Flats, C4, 10pm

STATH accidentally burns down a property, prompting a fallout with his exasperated father. Wanting to prove himself outside of the family business, he decides to take a job at Smethwicks, the agency next door, but struggles to fit in with the company’s “work hard, play harder” culture. Meanwhile, Al tries to train Sophie as Stath’s replacement, and although the pair bond, it becomes clear she is not cut out for the lettings world. Starring Jamie Demetriou, Alastair Roberts and Natasia Demetriou.