This week's UK TV & radio

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Listings for BBC 4 on Saturday, February 23 2019

05:30..programmes start at 7.00pm No programme information available 
11:30..programmes start at 7.00pm No programme information available 
17:30..programmes start at 7.00pm No programme information available 
18:58This is BBC Four This is BBC Four. Programmes start at 7.00pm. 
19:00Yellowstone: Wildest Winter to... ...Blazing Summer. 1/3. Documentary exploring Yellowstone, one of the most remarkable places on the planet. Kate Humble gets to grips with the science behind winter at Yellowstone. [S,AD] 
20:00Byzantium: A Tale of Three Cities Visiting the great mosques and palaces built by the Ottoman emperors, Simon Sebag Montefiore looks at how Istanbul became the imperial capital and Islam's most powerful city. [S] 
21:00Trapped 3/10. Torfi and Skuli remain the best lead for the attack Chief of Police is investigating. And Skuli is still on the loose. [S] 
21:50Trapped 4/10. With Skuli now eliminated from its lines of enquiry, and Mayor Hafdis in the clutches of the Hammer of Thor group, has the team lost precious time in its efforts to save Hafdis? [S] 
22:45Top of the Pops Gary Davies presents the pop chart programme, first broadcast on 23 April 1987, featuring Five Star, The Smiths, Kim Wilde & Junior, Tom Jones, Madonna and Terence Trent D'Arby. [S] 
23:15Top of the Pops Peter Powell and Steve Wright present the pop chart programme, first broadcast on 30 April 1987, featuring the Jesus and Mary Chain, Fleetwood Mac, Madonna and Duran Duran. [S] 
23:50Yellowstone: Wildest Winter to... ...Blazing Summer. 1/3. Documentary exploring Yellowstone, one of the most remarkable places on the planet. Kate Humble gets to grips with the science behind winter at Yellowstone. [S] 
00:50Secret Knowledge Lars Tharp appeals to the nation to help him recover a rare piece of long-lost William Hogarth memorabilia - a precious terracotta sculpture of the artist's beloved pet pug. [S] 
01:20The Defiant Ones 5/6. How, after a string of disappointments, Dr Dre's fortunes took a turn for the better when Jimmy Iovine introduced him to an unknown white rapper called Eminem. [S] 
02:00The Defiant Ones 6/6. Jimmy Iovine reveals how his fear that Napster would change the face of music led to the founding of Beats Electronics. [S] 
02:40Byzantium: A Tale of Three Cities Visiting the great mosques and palaces built by the Ottoman emperors, Simon Sebag Montefiore looks at how Istanbul became the imperial capital and Islam's most powerful city. [S,AD,SL] 
03:40This is BBC Four This is BBC Four. Programmes start at 7.00pm. 
05:30..programmes start at 7.00pm No programme information available