THE pick of tonight's TV

Wanderlust (BBC1, 9pm)

TONI COLLETTE doesn't make many British TV dramas, so this rarity about a couple trying to breathe life back into their marriage is all the more welcome.

In the latest offering, Joy deals with the fallout from Laura's discovery, and Tom's 'practice" with Michelle awakens surprising new feelings between the two friends. Meanwhile, the rules of experiment are put under serious strain as Joy bumps into first love Lawrence in a pharmacy, and Alan's connection to Claire becomes more intense. The ever reliable Steven Mackintosh also stars.

The Great British Bake Off (C4, 8pm)

IT'S Dessert Week and judges Prue Leith and Paul Hollywood set three sticky challenges to test the remaining nine bakers.

There is a meringue Signature, a wobbly Technical, and a complex chocolate Showstopper. Which bakers impress Prue and Paul enough to keep their place in the tent? And who will be following in the footsteps of recent bakers Imelda McCarron and Luke Thompson, who were among the first casualties of the 2018 season? Either Noel Fielding or Sandi Toksvig will be announcing that result at the end of the show.

Princess Margaret: The Rebel Royal (BBC2, 9pm)

IN the concluding part of this documentary, experts analyse the Princess's marriage to Lord Snowdon, aka Antony Armstrong-Jones, at the start of the early 1960s.

At home with celebrities and artists, they're riding the wave of a cultural and sexual revolution that's transforming Britain. The mystique of monarchy is being increasingly undermined by the emergence of a more open and egalitarian society. A fascinating look at one of the Royal family's most interesting and sorely missed characters.

Moped Muggers: Caught on Camera (ITV, 9pm)

THE number of crimes carried out by moped riders has been rising - even Home Secretary Sajid Javid has been a victim, as he revealed criminals on two wheels stole his phone outside Euston station in north London.

Now, this documentary takes a closer look at the phenomenon, hearing from other people who have been targeted and, as the title suggests, bringing viewers footage of the crimes being committed. We'll see a courier being brutally attacked for his bike, a jeweller who fought back against the thieves and some astonishing videos of the police in pursuit of the riders. Experts and former police officers are also on hand to offer their insights into this growing phenomenon as well as advice on how to avoid becoming a victim.

Killed on Camera (Channel 5, 9.15pm)

THE 2013 murder of 17-year-old Georgia Williams, a policeman's daughter and Army cadet who was tortured on camera by a friend and shop worker with fantasies about snuff movies, shocked Britain.

It also led to questions being asked of the police when it emerged that her killer had previously attempted to strangle another teenage girl in his home, which resulted in him being cautioned by officers. This documentary looks back at the horrifying case and some of the wider issues it raised.

The Circle (C4, 9.15pm)

MANY friendships and romances may have started - and ended - via social media, but how well can you ever really know someone based on their profiles?

That's one of the questions at the heart of his new reality series, which is broadcasting over three consecutive evenings. Presented by Alice Levine and Maya Jama, who both know a thing or two about the power of social media, it takes a group of contestants from all walks of life and moves them into separate apartments within the same building. They can only communicate via a voice-activated social media platform called The Circle, and the goal is to become as popular as possible. But how much of their online personas is real and how much has been invented to win new friends and a prize of up to £50,000?