In the semi-final, the four groups are brought together for the first time at bootcamp.
The candidates have to create a new virtual reality game and pitch it at Comic Con.
The candidates organise an exclusive event at two of London's top tourist attractions.
Two couples have a dance-off to decide who leaves. Rick Astley and Simple Minds perform.
The remaining seven couples take to the world-famous Blackpool Tower Ballroom dance floor.
Featuring members of a beatbox academy, an NHS choir and a group of Reading sixth-formers.
Gareth looks for an amateur choir to represent Scotland and the north of England.
Two couples have a dance-off to decide who will leave, and Laura Mvula performs.
The 10 remaining couples hit the dance floor for a ballroom battle to stay in the show.
The candidates introduce and sell a new product line in department store Liberty of London
Two couples have a dance-off to decide who will leave, and LeAnn Rimes performs.
The candidates must design, manufacture and sell their own brand of sweets.
The 11 remaining couples hit the dance floor for a ballroom battle to stay in the show.
Two couples have a dance-off to decide who will leave, and Madness perform.
The 13 remaining couples hit the dance floor for a ballroom battle to stay in the show.
The candidates are tasked with creating an advertising campaign for jeans.
It is time for another couple to leave the show as movie weekend builds to its finale.
The couples must deliver an amazing routine to a classic movie track.
A new set of candidates begin their first task, selling collectables at a car boot sale.
One couple leaves the contest, and Barry Gibb performs.
The 15 couples hit the dance floor together for the first time.
The remaining nine couples dance for the first time in a bid to impress the judges.
It is showtime as six celebrities perform their first routines with their partner.
It is the grand final. One orchestra wins the chance to perform at Proms in the Park.
The remaining orchestras take on the concerto - a piece featuring a virtuoso soloist.
The four remaining amateur orchestras must get to grips with the challenges of opera.
Tess Daly and Claudia Winkleman launch a new series of the celebrity dance contest.
The first challenge is to master that pinnacle of orchestral playing - the symphony.
The six finalists go head to head in a battle of the bands at the Ritz in Manchester.
Soul II Soul's Jazzie B joins Rhod Gilbert for a road trip across southern England.
Rhod Gilbert and Peter Hook take a road trip across northern England and the Midlands.
Rhod Gilbert and Midge Ure take a road trip across Scotland, Northern Ireland and Wales.
The final teams must present a dessert banquet with enough desserts to feed 100 guests.
Graham Norton introduces and commentates on the 61st Eurovision Song Contest.
Eighteen acts battle it out, but who will win the final ten places in the grand final?
The teams must build decorative chocolate structures to display different types of sweets.