This week's UK TV & radio

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Listings for Channel 4 HD on Tuesday, April 24 2018

06:00Countdown Nick Hewer and Rachel Riley host as contestants race against the clock to pit their wits against vowels, consonants and numbers. Jimmy Osmond is in Dictionary Corner with Susie Dent. 
06:453rd Rock from the Sun Dick and Taxes The aliens learn about tax when they attempt to file their first tax returns. Mary discovers that Dick owes nearly $10,000, and Sally opens a hair salon to claim deductions. 
07:103rd Rock from the Sun Sally Forth The aliens and Mrs Dubcek start feuding because she won't get their plumbing fixed and they won't pay their rent. Don mistakenly thinks Sally wants him to propose to her. 
07:35Everybody Loves Raymond A Job for Robert Ray is jealous when Marie starts treating Robert better than him. 
08:00Everybody Loves Raymond A Date for Peter Amy's parents ask Ray to give their son, Peter, some tips on dating. Debra throws a cocktail party but Ray isn't impressed by the guest list. 
08:30Frasier How to Bury a Millionaire Niles has to move in with Frasier after his divorce leaves him strapped for cash. 
09:00Frasier The Seal Who Came to Dinner While hosting an exclusive dinner party for The Gourmet Society at Maris's beach house, Frasier and Niles have to deal with a smelly washed-up seal carcass. 
09:35Frasier Roz, a Loan Unemployed Roz is happy to hear that KACL might be rehiring everyone. 
10:05Ramsay's Hotel Hell Gordon Ramsay returns to the USA to help Angler's Lodge in Idaho, a stunning venue whose owners have been struck by family tragedy. Can Gordon rescue the broken family's business? 
11:00Undercover Boss USA Jim Rogers, Chairman and CEO of Kampgrounds of America, the largest campsite organisation in the world, goes undercover disguised as an accountant to see how his business is working. 
12:00Channel 4 News Summary Channel 4's midday news summary. 
12:05Coast vs Country John and Karen live in Cheshire and have ?400,000 to spend in North Wales. John would love to have the sea close by, while Karen loves the changing colours of the countryside. 
13:05Posh Pawnbrokers The show that goes behind the scenes of high-end pawnbroking. Nathan and Debbs are doing deals on a life-size majolica lion and racing silks owned by legendary jockey AP McCoy. (S1 Ep3) 
14:10Countdown Nick Hewer and Rachel Riley host as contestants race against the clock to pit their wits against vowels, consonants and numbers. Chris Packham is in Dictionary Corner with Susie Dent. 
15:00A Place in the Sun: Home or Away Recently retired Nick and Jane Purser can't decide where to settle: Lancaster, or Marseillan in southern France? Jasmine and Johnnie show them six potential properties. 
16:00Escape to the Chateau: DIY Billy faces the tricky task of repointing the chimney - despite being scared of heights. Clive and Tanith get their hands dirty. And the clock's ticking for sisters Marian and Tanya. (Ep12) 
17:00Four in a Bed The second visit is to the Kilpeck Inn in Herefordshire where head chef Ross Williams and front of house manager Kath Capel consider no detail too small. But is one guest out for revenge? 
17:30Buy It Now Steve and Sue showcase their product to help kids during car journeys; Tim from Dorset has a pocket-sized product for male grooming; Andrew demonstrates his nifty, reusable product. (Ep7) 
18:00The Simpsons Married to the Blob Cute comic fan Kumiko, who's researching material for an autobiographical manga, visits Comic Book Guy's shop, so he asks Homer's advice on how to woo her. (S25 Ep9/22) 
18:30Hollyoaks Sienna panics about an encrypted email she's received, while Esther reveals some truths that could jeopardise Darcy and Jack's future. Jesse tries to make amends with Goldie and Courtney. 
19:00Channel 4 News Includes sport and weather. 
20:00Class of Mum and Dad The parents have settled in well at Blackrod Primary School, but some struggle with the rules. Imogen is late and sent out of class. And soon it's time for parents' evening. (Ep3/4) 
21:00Fatberg Autopsy: Secrets of the... ...Sewers There's an epidemic of fatbergs under Britain's streets. But why? A team of experts head to east London to analyse one of the biggest ever, revealing the nation's dirty secrets. 
22:00The World's Most Luxurious Airline A look behind the scenes as Singapore Airlines bids to create a whole new level of opulence and luxury for their first class travellers - proving that the sky really isn't the limit at all. 
23:00Flight HS13: Walter Presents Crash Tense thriller from the Netherlands about a woman's search for the truth behind her husband's mysterious disappearance and the secrets she uncovers. In Dutch and Farsi/subs. (Ep1/10) 
23:55Ramsay's Kitchen Nightmares USA Gordon heads stateside in a bid to rescue failing restaurant owners from imminent disaster, travelling to Newbury Park in Southern California to Mexican restaurant Mama Ritas. 
00:45One Born Every Minute Dawn and Scott have seven children between them and are expecting their first baby together. But Dawn is terrified; it's 10 years since she had her last one. (S11 Ep7/10) 
01:45The Secret Life of the Zoo Kendari the babirusa is pregnant, but otters Wallace and Annie keep throwing stones at her house. Next door, orangutan Willie is struggling to impress females Sarikei and Leia. (S2 Ep2/6) 
02:40The Channel: The World's... ...Busiest Waterway: The English Channel is the world's busiest waterway: 400 ships pass through the Dover Strait each day. This series meets the people who keep the system working. (Ep1/4) 
03:35Come Dine Champion of Champions Stelios Michael battles against Margaret Fanion and JP Goddard. JP tries to make the eight dishes in Margaret's amuse bouche starter, but will it amuse Glynn Purnell's bouche? (Ep1/5) 
04:30Building the Dream Charlie Luxton helps a couple in Loughborough, who can't agree on what the dream home they're building in their back garden should look like - traditional or contemporary? (S4 Ep9/9) 
05:25Steph and Dom's One Star to... ...Five Star: It's the final day at The Daleshurst guest house in Paignton, and Steph and Dom hand back control to the owners. But can they get that elusive five star rating? (Ep10/30) 
05:50Kirstie's Handmade Treasures Kirstie Allsopp wants to surprise some guests with two delicious mains: roast beef with mulled wine gravy, and one for the vegetarians: masala cauliflower with coconut stuffing. 
06:00Countdown Nick Hewer and Rachel Riley host as contestants race against the clock to pit their wits against vowels, consonants and numbers. Jimmy Osmond is in Dictionary Corner with Susie Dent.