Tonight's TV

Have I Got News for You (BBC1, 9pm)

TAKE great guests, witty team captains and a cynical host, add a dose of acerbic comedy, and what do you get? That's right, Have I Got News For You, which is back for its 56th series this week.

Little has changed since the show began over on BBC Two back in 1990 - apart from the absence of Angus Deayton as host. He left in 2002 to be replaced by a variety of guest presenters. Although not every one of those has worked out, the show has seen a large number of famous faces that have returned to take part in the show repeatedly. Pointless star Alexander Armstrong is the record holder, having appeared 31 times over the years, with Jo Brand just behind him on 22 outings. The identity of tonight's guest host remains a mystery, but what we do know is that Ian Hislop and Paul Merton are itching to get their teeth into a full summer's worth of stories.

The Gadget Show (C5, 7pm)

THE new series begins with Jon, Ortis and Georgie reforming the G Team to help dog-lover Rachel, who wants some innovative tech ideas for her beloved pooch.

The team don't disappoint, pulling something called the OPuff-n-Fluff' out of the bag. Jon then heads to Weston-super-Mare pier to put three leading noise-cancelling headphones from Bose, Sony and Nuraphone through their paces. He tests for performance, comfort and sound quality, but can these devices drown out all the fun of the fair? Gaming expert Jordan Erica Webber reports from the world's most prestigious video games festival, gamescom, where she explores the world of Fortnite, and gets a first look at one of the year's biggest releases, Assassin's Creed: Odyssey.

The Great Model Railway Challenge (C5, 8pm)

NEW series. James Richardson and Tim Shaw lift the lid on a globally popular hobby, beloved by legions of unsung artists who have been quietly building tiny universes for the littlest of locomotives in attics and sheds for decades.

Here, teams of the UK's most talented railway modellers compete in a series of knockout heats to create jaw-dropping miniature masterpieces against the clock. The first heat sees Strangers on a Model Train, Team Porthcawl and Missenden Modellers compete. The judges are editor of Railway Modeller Steve Flint and renowned modeller and vlogger Kathy Millat.

The Debt Saviours (BBC2, regions vary)

ACROSS Britain more than four million people have debts that are considered unsustainable and responsibility for advising and helping these vulnerable people is increasingly falling to charities.

One of the biggest is Christians Against Poverty (CAP), led by its charismatic evangelical founder John Kirkby. This documentary follows Kirkby and some of the charity's debt counsellors. CAP has more than 6,000 staff and volunteers around the country, providing help to people who often face losing their homes.

The Big Audition (ITV, 9pm)

"IF you get your casting right, then half your work is done on the day," said Ridley Scott once.

And he was the man who helped turn the likes of Sigourney Weaver and Brad Pitt into stars. But what of those still hungry for fame? Well, that's where this new series proves so compelling as it takes a look behind the scenes of the casting world. Each week three jobs are up for grabs, from West End lead to stunt double and everything in between. Episode one features the search for a dog model, a TV shopping presenter and King Henry VIII.

The Graham Norton Show (BBC1, 10.35pm)

ROWAN ATKINSON chats about new release, Johnny English Strikes Again, while actress Jamie Lee Curtis reflects on reprising her role as Laurie Strode in the new Halloween, 40 years after the original movie.

Pop impresario Gary Barlow talks about his autobiography A Better Me, while Hollywood king of cool Jeff Goldblum chats and performs Straighten Up and Fly Right with Imelda May. Plus, a another bunch of intrepid audience members attempt to recount an anecdote from the dreaded red chair.