Double Decker Driving School (ITV, 8.30pm)

NO, this isn't about taking to the roads while consuming a chocolate bar, but a six-part documentary series focusing on the ultra-competitive world of trainee London bus drivers.

With 20 applicants for every place on the intensive six-week course, the bus drivers’ school promises to be a gateway to a steady salary and a virtual job for life. First, however, the prospective drivers must learn how to safely negotiate a ten-ton bus through London’s overcrowded streets.

The trainees are filmed from the first moment they sit behind the wheel of a bus through a set of increasingly complex manoeuvres designed to test their abilities to the limit.

Those who make it through the early stages then face the toughest assessment of all – a bus driving test including a 90-minute examination. This will determine if the trainees have what it takes to achieve their dreams, and make it as a bus driver.

“When you’re out there you think you’re the world’s best driver. Until you come into an environment like this. And that’s when you come down with a bang.” says Jim Johnston, bus training officer

In the first episode, a new batch of recruits are starting their six-week course. Single mum and former van driver Claire Carter is hoping that becoming a bus driver will be a smart move - with the steady salary a key motivation for her. She says: “If I do this then next year hopefully it might mean I can take my kids on holiday.”

On her first day, Claire has a close encounter on a pedestrian crossing and nearly has a head-on collision. With the help of her instructor Alagarsamy Gopal, Claire needs to summon the strength to pursue her goal. She says: “When I got home I was so deflated. I was talking to my eldest son saying, ‘I don’t think I can do this'. And he was like, ‘Mother, pull yourself together'.”

Meanwhile, former recovery driver Yasin Cassim has moved to London from Gloucester to try and gain a bus driver's official cap. He’s four weeks in and he and his instructor Mickey Welch are getting on famously, but Yasin rarely believes mistakes are his fault.

Mickey says: “Some of them think they know it all, but they don’t. If you don’t listen you won’t last long on this job. Just open your eyes.”

And when Yasin has a progress check with training officer Jim Johnston, sparks fly.

The Triplets Are Coming! (ITV, 9pm)

CAN we cope with more newborn news? Chris and Steph Webb clearly hope so, because they're the latest contenders in the One Born Every Minute and Call the Midwife genre.

The Webbs are expecting triplets thanks to in vitro fertilisation (IVF) and are joining around 200 sets being born in Britain every year. Staff at London's University College Hospital's multiple birth clinic give us the lowdown on the joy and pain of instant, "buy one, get two free" families, as well as Paul and Tracy Kirby, who conceived naturally and were stunned when a scan revealed they were expecting three babies.

At their 23-week scan, they are alarmed to find one of the babies has stopped growing properly. Two of the babies might be suffering from "twin-to-twin transfusion" where an uneven blood supply means one is getting too big, while the other remains too small.

Their decision on what to do next proves more gripping than any thriller.

The Truth About Sugar (BBC1, 9pm)

JOURNALIST Fiona Phillips is determined to find out what's so bad about a few sweet treats, and what exactly does sugar do to the body that makes it such a problem. She learns why some people have more of a sweet tooth than others, which sugars can be enjoyed guilt-free, and what effect sugary drinks have on the appetite.However, she soon realises that sugar is hidden in places she'd never have thought, from ketchup to bran flakes.