Historian Dan Snow takes viewers on a unique journey through the squalid grime of the past in this new, three-part series which uncovers the filthy histories of three of the world's leading modern cities: London, Paris and New York. Dan begins by visiting 14th-century London, lifting the lid on the untold story of the city's fetid past. Dan gets down and dirty in medieval grime to discover the hard way how the London we know today was forged in the filth of the 14th century. CGI peels back the layers of London's streets and, as they are revealed as they were 700 years ago, Dan steps into the shoes of a medieval Londoner – with wooden platforms designed to help him rise above the disgusting mess underfoot. He also spends the night as a medieval muck-raker, shifting six tonnes of filth and excrement, and even has a go at medieval butchery. In his quest to immerse himself in all things medieval Dan also investigates the remains of a plague victim, and learns how the catastrophic Black Death epidemic helped a cleaner London emerge from the muck of the past. Viewers can press the red button or visit bbc.co.uk/filthycities to unearth extra filthy footage and join Dan on his journey. Viewers can also experience the real smell of history for themselves with special scratch-and-sniff cards available in libraries – more information is available via the website. RA/EB To top

Kate Humble joins the Marston family in Cumbria for Lambing Live Following the success of the first series, Lambing Live returns with a brand new series and a new set of challenges. Last spring, Kate Humble and Adam Henson tested their shepherding skills on a lowland farm in Wales, but this time the life-and-death drama of lambing is heading for the hills in Cumbria. Lambing can be a fraught and sometimes risky business and for five nights Lambing Live will be right at the heart of the action with live nightly updates. There's a new farm and a new family as Kate is apprenticed to the Marstons – a sheep-farming dynasty spanning three generations who have made their lives in the remote and sometimes harsh world of hill farming. For the Marstons, it's not just about the numbers, it's about breeding stock and they're looking for quality and pure blood lines. Kate once again gets her hands dirty on the farm, helping to make sure as many lambs as possible survive those crucial first days after birth. Though Kate has a good grasp of the shepherding basics, since September she's been discovering that hill sheep demand a new set of skills and a whole new language. It's now time for Kate to put everything she's learnt into practice – but it won't be easy. Lambing with the Marstons will also be a challenge for Adam – he's used to lambing indoors on his own farm in the lush and relatively low lands of the Cotswolds but he's about to get a real taste of what it's like to be a hill farmer, putting his skills to the test in a very different environment. Alongside the day-to-day action on the farm, Adam once again travels the UK to explore British sheep farming in all its many and varied forms. From the wool that once made Britain great to the science behind their flocking instinct, Lambing Live tells the surprising story of sheep farming in Britain, past and present. For behind-the-scenes information on Lambing Live you can follow @BBCsecretsheep on Twitter. CD4 To top

Louis Theroux returns to Kansas to catch up with America's Most Hated Family Following up on his hugely popular and acclaimed 2007 documentary The Most Hated Family In America, Louis Theroux returns to Topeka, Kansas, for a second visit to the Westboro Baptist Church. A fire-and-brimstone Christian group, made up of 80 or so members of the Phelps family, the WBC have made themselves notorious in America – and worldwide – for their pickets of the funerals of soldiers killed in action, where they wield anti-gay placards. The Phelps believe the soldiers were killed as part of God's punishment of America for its toleration of homosexuality. But, four years on from Louis's last visit, there are signs of disarray in the Phelps clan. A series of defections of family members has shaken up the church. They've been at the centre of a landmark Supreme Court case and, possibly because of the resulting attention, their beliefs have become increasingly bizarre. In America's Most Hated Family In Crisis, Louis is once again granted a behind-the-scenes look at America's most controversial Christian group as it gears up for what it sees as the final showdown with doomed America. Louis explores the church's strange new belief that Obama is The Beast spoken of in the Book Of Revelation, and their conviction that we are now in the run-up to the second coming of Christ. But the church members have now seen his first documentary and, as a result, they revile Louis, who they see as one of the most evil men in all human history – alleging that he is on a par with Pontius Pilate for his supposed mockery of true Christianity. Yet the church members also see the spreading of their message as a necessary part of the church's out-reach, even if it means spending time with a hopeless unbeliever. Louis also tracks down two of the departed members – young women, both of whom he had interviewed in the first film when they were still inside the church. He probes the parents of the apostates, who have "cut off" their renegade daughters, and who now affect a strange and chilling indifference to the separation. Louis gets under the skin of the church members, showing the human cost of living as part of an extreme religious group: the secret pain of parents who've turned their back on their children; and the forbidden yearnings of the younger female devotees. CD4 To top

Later Live ... With Jools Holland returns to BBC Two for a new, nine-week run. Joining Jools in the studio for tonight's opener are Elbow, who return to the show with tunes from their fifth studio album, Build A Rocket Boys!. Also from Greater Manchester – although now London-based – are Liam Gallagher's Beady Eye, who make their first appearance on Later with songs from their debut album, Different Gear, Still Speeding. BBC Sound of 2011 finalist Anna Calvi also makes her Later debut, leading her trio with songs from her self-titled debut album. Retro-soul king Raphael Saadiq returns to the show with songs from his latest solo album, Stone Rollin'; and Sweden's The Tallest Man On Earth, aka solo artist Kristian Matsson, is introduced, bringing his Dylanesque delivery and formidable acoustic guitar picking. For additional exclusive content, the Later... website features exclusive performances and interviews with acts on each week's show. And, as always, the extended Later ... With Jools Holland offers a fuller buffet of performances and chat, with occasional surprises. Later Live ... With Jools Holland is simulcast on the award-winning BBC HD channel – the BBC's High Definition channel available through Freesat channel 109, Freeview channel 54, Sky channel 169 and Virgin Media channel 187. SG To top