Tonight's TV highlights

Edwardian Farm 8pm, BBC2 Alex, Peter and Ruth have spent six months living as Edwardian farmers at Morwellham Quay, a period which has seen them variously make their own quicklime, shave beards, grow them back and try their hands at market gardening. In a way, though, this is the most involving episode so far. It's February, the days are short, and, rather than focusing on a specific aspect of their lives, we spend a full day with them. From a pre-dawn brush of the teeth (with soot) and a tussle with the hayrick to egg-grading and a late afternoon game of football, it's a hard life. Still, at least there's beer at the end. JR The Million Pound Drop 8pm, Channel 4 Davina McCall hosts four festive episodes of the interactive game on consecutive nights. While couples in the studio agonise over whether to put their million quid on Daniel Craig, George Lazenby, Timothy Dalton or Good King Wenceslas, viewers at home can go one better than just screaming the answer at their ignorant faces behind the glass. They can play at home on the internet. Like they've smashed the screen, climbed into the studio and grabbed the cash from under Davina's very nose, yelling, "See, it IS that easy!" JNR Ancient Worlds 9pm, BBC2 At its zenith, the Roman empire extended from Hadrian's wall to the Euphrates. But while its 60 million people enjoyed prosperity under the Pax Romana, the imperial system had a key weakness, argues Richard Miles: relying heavily on a non-doctrinaire brand of polytheism and giving its people bread and circuses ("cheap food and cheap thrills"), it wasn't big on the big questions. It was thus peculiarly ill-equipped to resist Christianity. Miles concludes an excellent series in upbeat style. JW Ugly Betty 9pm, E4 She's lost the braces at last – and now it's nearly time for the not-really-that- ugly-at-all Betty to leave our screens. But, luckily for fans of such things, there's still time to cram in one of those "Hey gang! Let's go to London!" episodes that US comedies occasionally delight in. No sign of Fergie reprising her role in Friends, but we do get to see what Betty, Amanda and Hilda make of London Fashion Week ("the training bra of fashion weeks," as Daniel puts it), and there's time to check up on Christina (Ashley Jensen). RV Fanny Cradock Cooks For Christmas 10pm, Good Food Before Jamie did casual, Nigella did smutty and Heston did bonkers, Fanny Cradock was the TV chef to turn to for advice on your Christmas menu. Here, as a reminder of her reign of terror, are three episodes of Fanny Cooks Christmas, now helplessly camp displays of eyebrow creativity, crinoline menace and unintentional double entendres. If you're looking for the nightmare before Christmas, this may well be it. RN Megastructures 10pm, National Geographic They call it "black toothpaste", marine clay, and as indicated by the nickname, it's not the most solid foundation on which to build things. Which, potentially, is a bit of a 'mare for the creators of Marina Bay Sands, the world's most expensive standalone casino in Singapore. But can the $5billion project (which includes a new sculpture by Antony Gormley, above) also overcome three precariously sloping skyscrapers, and the biggest financial crisis since the 1930s? Well … yeah. Otherwise this would be a completely different kind of documentary, bound for the History Channel. But, frankly, it's a wonder this marvel was completed at all, let alone three years before deadline. AJC