The Great British Sewing Bee (BBC2, 8pm)

WE'RE being promised the most complex, and trickiest challenges ever seen in the Sewing Room for the final three competitors left. During this contest we've seen some surprising creations - especially during the children's clothes episode, when we were treated to a ballerina elephant, two peacocks and a bookworm, not to mention a pair of boxing gloves for a five-year-old.

However, it seems the judges Patrick Grant and May Martin have saved the most outrageous until last as they challenge the finalists to come up with some cutting edge designs. As well as a pattern challenge that resembles origami more than sewing, and a radical alteration challenge, they also have to make an avant-garde dress.

So, think more Lady Gaga than the Doris Day soundtrack and cute vintage prints we normally see on this series. As always, not everyone can win, so just one pair of hands will be be on the coveted gold mannequin trophy.

Sadly, one of the contenders comes up with a creation that is certainly structured, but falls down on the alteration challenge that the outfit must be wearable.

The Supervet (Channel 4, 8pm)

THERE'S no rest for supervet Noel Fitzpatrick as this week, Stampy, a cavachon, is brought in after being hit by a car. He is in a critical condition and owners Jim and Karen deliberate as to whether their dog should have surgery or be put down. Meanwhile, a dog owner from Preston travels for seven hours with his golden retriever to get advice from Noel. Finally, dachshund Lilly-Belle comes in with owner Ginny, who explains that the poor pooch has lost the use of her back legs. Can she be cured?

Jimmy Savile: Britain's Worst Crimes (Channel 5, 8pm)

HAVING had the misfortune of trying to investigate Jimmy Savile's misdemeanours at Stoke Mandeville Hospital in the early 1970s and been warned off by the hospital's official spokespeople, who denied he had an office or used a bedroom on the premises, I could never regard Mr Savile as a national treasure.

The fact remains that in my line of work I came across the DJ and TV presenter regularly and had to acknowledge that he raised £40 million for charity, receiving an OBE in 1971 and a knighthood in 1990.

Following his death in 2011, the side of Savile I'd been told about began to emerge as victims came forward claiming he had used his celebrity status to prey on them. An investigation into his activities, launched in October 2012, led to allegations dating back to the 1950s, involving men, women and boys, but mainly vulnerable young women whom he was reported to have abused in television dressing rooms, schools, children's homes, hospitals and his caravan. He's now believed to have been one of the worst sex offenders the UK has ever seen.

Featuring contributions from Savile's alleged victims, family members and former colleagues, this documentary looks at the scandal and asks how such a prolific predator could get away with his crimes for so long.

Comic Relief Operation Health (BBC1, 9pm)

IN this documentary, Lenny Henry and a band of famous volunteers are going to go even further, and attempt to make over a rural health centre in Uganda. The staff say it might be the worst in Africa, and Lenny and his team - which includes Richard Hammond, Dermot O'Leary, John Bishop, Steve Backshall, Greg James and Doon Mackichan - quickly realise they weren't exaggerating. The building has no electricity or running water, is infested with rats and other vermin, and many patients are too afraid to spend the night there.

The team have just weeks to turn into a fully functioning health centre capable of meeting the needs of the community, but the celebs are keen to point out that the real heroes of the project are locals like Francis the Doctor, Dorothy the midwife and Gonza the master builder.