Who Do You Think You Are? (BBC1, 9pm)

FORTY years on from becoming the world’s first supermodel, Twiggy, who began life as Lesley Hornby, remains a fashion icon, now designing as well as modelling. Her celebrity status began aged 16 when by a reporter noticed her photograph on the wall of a Mayfair hairdresser and ran a story describing her as the face of the 60s.

Now 65, Twiggy becomes the 100th well-known face to be featured on the show which searches for long-lost relatives and solves family mysteries.

"It was madness. I was suddenly in the newspapers and being flown all around the world. We were a very ordinary, happy family, and I had a happy childhood - I grew up in Neasden, which is a suburb of north-west London. We didn't have lots of money but, you know, we had a car, we had a telly. I had my mum and dad; I had my sisters,” she sats.

But while she loved and adored her father, she explains things with her mother were slightly more complex. "That doesn't mean I didn't love and adore mum, but she was much, much more complicated. She suffered with her nerves. My mum didn't like talking about the past. I have a vague memory of her dad who died when I was, I think about four-ish. I know nothing about her mum. I don't get the impression she was from a bad family or there was anything wrong with them. I think she was very close to her mum and dad."

Admitting that her parents were very closed when it came to discussing her family, it seems the programme may just throw a few shocks at her.

Once again, the close-mouthed parents are hiding desperately sad tales of destitution, desertion, workhouses, prison sentences, rogues and vagabonds. She discovers that her maternal grandma, Alice Meadows, grew up in terrible poverty and that the family was torn apart when Alice's father William deserted his seven children and left them facing the workhouse. Thankfully, William's mother, Grace, was no saint but showed she was determined to survive a tough upbringing.

“I’ve learnt that the women in my family were incredibly strong... but I’m glad I wasn’t born 150 years ago,” Twiggy says.

Educating the East End (Channel 4, 9pm)

THE GCSEs are looming, but for some of the kids in Year 11, revision is way down their list of priorities, lurking somewhere below the prom, their mates and members of the opposite sex. On the face of it, Paige seems to be able to cope with balancing exam pressure with an active social life. Not only is she predicted to get good grades, she's also one of the most popular pupils in school - her and friends Georgia and Yasmine are the Year 11 students that the younger girls look up to and the boys fancy. The strain starts to take its toll on the trio's friendship, leading to fears that everything they've been working towards is about to be derailed.

Forever (Sky 1, 9pm)

THE actor with the difficult to pronounce name, Ioan Gruffudd, gets into his stride as the regenerating more than Doctor Who medic Dr Henry Morgan, who has a Sherlock Holmes-like ability to sniff out crime as a New York medical examiner. This week he’s worked out how and why an apparent suicide by jumping off a bridge was actually murder. Cyclists may have to avert their eyes as Gruffudd’s character finds a way on two wheels to die and be reborn in the river.