Olympics 2016: Heroes of London 2012 going for gold in Rio – in pics
The Team GB Olympic champions who will be defending their titles at the Rio Games this summer
Jessica Ennis-Hill: Heptathlon
The poster girl of London 2012 was in dominant form in London. She won the event with a British and Commonwealth record score of 6,955 points and set three personal bests in the competition. After taking time off to start a family, Ennis-Hill returned to action last year and has been in good form so far this season.
Bradley Wiggins: Cycling
It's safe to say 2012 was a good year for Wiggins. He became the first British winner of the Tour de France and a couple of weeks later won the men's time trial at London 2012. He will be competing on the track at Rio and aiming for a gold medal in a third successive Olympic Games.
Charlotte Dujardin: Dressage
Dujardin won two golds in three days at London 2012. She was part of the trio that won the team dressage event and then followed it up with gold in the individual event. She will be riding her horse Valegro, who helped her to glory in London, for the last time in Rio, as he will retire after the Games.
Mo Farah: 10,000m and 5,000m
As if winning the 10,000m on 'Super Saturday' wasn't enough the British distance runner followed that up with victory in the 5,000m a week later. He has since gone on to win back-to-back world titles in both events. More success in Rio would cement his place as one of the all-time greats.
Katherine Grainger: Rowing
Grainger's triumph at London 2012 was one of the most heartwarming stories of the Games. She had finished second at Sydney, Athens and Beijing and her chance for glory appeared to have passed her by. But with partner Anna Watkins she triumphed in the double sculls. She will defend her title at the age of 40 with her new partner Vicky Thornley.
Alistair Brownlee: Triathlon
The Brownlee brothers, Alistair and Jonathan, have dominated the sport of triathlon for years and Alistair's victory in London came as no surprise. He will be one of the favourites for gold again in Rio, although Jonathan, who was devastated to finish third in 2012, will be after revenge.
Laura Trott: Cycling
The golden girl of British cycling came from nowhere to become one of the stars of London 2012. She won gold in the women's team pursuit, with Dani King and Jo Rowsell, and followed it up with another gold in the omnium event. She will be hoping for even more glory in Rio.
Andy Murray: Tennis
Gold at the London Olympics proved to be something of a turning point for Andy Murray, who at the time had yet to win a Grand Slam tournament. But after beating Roger Federer in the final he went on to win the US Open and Wimbledon the following year. He will be one of the favourites for gold in Rio.
Helen Glover and Heather Stanning: Rowing
Glover and Stanning won Team GB's first gold medal of London 2012, triumphing in the women's coxless pair. Two years later they set a world record at the world rowing championships and they go to Rio as world, Olympic, world cup and European record holders, plus the reigning Olympic, world and European champions.
Jason Kenny: Cycling
Like his fiancee Laura Trott, Kenny won two golds in London 2012. He triumphed in the men's team sprint, with Chris Hoy and Philip Hindes (who will also be competing in the team sprint at Rio) and also the men's individual sprint. He will be part of the track team once again in Rio with the chance of a gold medal in the third successive Games.
Nicola Adams: Boxing
The Leeds fighter became the first woman to win an Olympic boxing medal when she beat Chinese world number one Ren Cancan in the flyweight final in London. She also won gold at the 2014 Commonwealth Games and the 2015 European Games. After her 2012 success, she was named the most influential LGBT person in Britain.
Greg Rutherford: Long jump
The least well-known of the British athletes to win gold during one amazing evening at the Olympic Stadium in 2012 (the others were Jessica Ennis and Mo Farah), Rutherford has established himself as a world class competitor and went on to win the world title last year. He will be in the mix once again in Rio.
Jade Jones: Taekwondo
She was just 19 when she triumphed at the London Games, beating Hou Yuzchuo of China in the final to become the first ever Briton to win a taekwondo gold. Her nickname is the "headhunter" as she tries to score points from the opponent's head rather than body.
Nick Skelton and Ben Maher: Equestrian
Team GB's four-man jumping team triumphed in London and two of the team will be back to defend their title in Rio. At the age of 58, Skelton will be one of the oldest competitors in Rio and he will be competing in his seventh Games. At just 33, Maher is a relative youngster, but will be aiming for a second gold.
Katherine Copeland: Rowing
Copeland and her lightweight double scull partner Sophie Hosking only joined forces at the start of 2012, but they kick-started 'Super Saturday' with the first gold of what was to become Team GB's most successful day at the Games since 1908. This year she will compete with Charlotte Taylor. Another rowing gold medallist from Super Saturday, Alex Gregory, who was part of the men's four, will also be defending his title in Rio with new team-mates.
Geraint Thomas, Ed Clancy, Steven Burke: Cycling
Three members of the men's team pursuit foursome will be in the saddle in Rio. However, Geraint Thomas, who won track golds at Beijing and London will compete in the road race with Tour de France winner Chris Froome. Clancy and Burke, however, will be hoping for places in the pursuit team alongside Bradley Wiggins and Mark Cavendish.