Career: Carr began performing on the stand-up circuit, doing up to 300 shows a year for three years, before taking his act to the Edinburgh festival in 2002. This brought him to the attention of TV bosses, and before long he was presenting series such as Your Face or Mine and Distraction. Since then, he's rarely been off TVscreens, hosting the first run of the Friday Night Project, 8 Out of 10 Cats and numerous Channel 4 list shows. He's also made a move into acting, appearing in Alien Autopsy, Confetti, Stormbreaker and Telstar. He is one of Britain's busiest comics and his DVDs are big sellers.

Career: Riley's big break came in 2008 when she was chosen from more than 1,000 applicants to replace Carol Vorderman on Countdown. She presented her first show alongside Jeff Stelling in January 2009, and reached her 1,000th episode in June 2013. Away from the numbers and letters on Countdown, she began co-hosting The Gadget Show alongside Jason Bradbury in June 2013. She was a contestant on Strictly Come Dancing in 2013 and was the fifth celebrity to be eliminated.

Career: Lock's first professional TV appearance was in 1993, when he appeared in a supporting role alongside Rob Newman and David Baddiel on their signature TV show Newman and Baddiel in Pieces. He toured with the duo as their support act and, as a result, became the first comedian to perform at Wembley Arena. He script-edited the 1998 BBC Two series Is It Bill Bailey? and had his own show on BBC radio, 15 Minutes of Misery. It was later expanded into the half-hour series, 15 Storeys High. He's now a team captain on the panel game 8 Out of 10 Cats. Other game show appearances have come in the likes of The Big Fat Quiz of the Year, Have I Got News for You, QI, and They Think It's All Over. He also hosted his own entertainment show on Channel 4 called TV Heaven, Telly Hell.

Career: Carr made his TV debut as a guest on the ITV lunchtime show Today with Des and Mel. He came to true prominence on Channel 4's The Sunday Night Project with Justin Lee Collins. He makes regular guest appearances on panel shows such as 8 Out of 10 Cats and Never Mind The Buzzcocks and has featured as a panellist on Channel 4's annual Big Fat Quiz of the Year, a staple of the Christmas TV schedules. He has also fronted his own game show, Alan Carr's Celebrity Ding Dong, written his autobiography, and continues to perform stand-up. His Channel 4 show Chatty Man attracts some of the biggest names in showbiz and has been a staple of the Channel 4 schedule since 2009. He also presented a weekly programme on Radio 2 for three years, and fronted game show The Singer Takes It All. In 2016, he hosted Alan Carr's Happy Hour, which was a spin off of Chatty Man.

Career: Tate's TV career began with small parts in serial dramas Casualty and The Bill, while her comedy talent was nurtured on The Harry Hill Show, Big Train, That Peter Kay Thing and Wild West, a series she made while pregnant. As well as her critically acclaimed comedy series The Catherine Tate Show, she has also appeared in Bleak House, on the West End stage and in the US version of The Office. The comedienne acquired a new set of fans when she became Doctor Who assistant Donna Noble; she reunited with co-star David Tennant in Much Ado About Nothing in London's West End during the summer of 2011.

Career: In 1995, Buxton and Cornish submitted a video sketch for a comedy show on Channel 4 called Takeover TV. This led to them being hired to do continuity links and a year later, they were given their own show on Channel 4 called The Adam and Joe Show. This ran for four series between 1996 and 2001 and it took the form of short sketches interspersed with links filmed from a bedsit. Buxton's father, Nigel, appeared in a weekly sketch as the character BaaadDad. Buxton and Cornish went on to present radio shows on Xfm and BBC Radio 6 Music. Buxton boosted his acting CV with roles in Randall and Hopkirk (Deceased), Swiss Toni, The IT Crowd, Hot Fuzz (2007), Son of Rambow (2007), Stardust (2007), The Persuasionists and Country Man. Since 2007, he has hosted the BFI's music video showcase Bug. A TV version, Adam Buxton's Bug, was shown on Sky Atlantic in 2012. Buxton guest starred in several episodes of 8 Out of 10 Cats Does Countdown in 2014 and 2015. He has produced The Adam Buxton Podcast since September 2015.

Career: Osman has worked behind the scenes as an executive producer on a number of TV programmes, including Deal or No Deal, 8 Out of 10 Cats, and 10 O'Clock Live. As the UK creative director of TV production company Endemol, he pitched the quiz Pointless to the BBC. As a way of explaining the rules, he played the co-host during a run-through. He was asked to do the role for real when the show was commissioned. Pointless started on BBC Two in 2009 and was an immediate hit. It quickly made the switch to BBC One. Since being in the spotlight on Pointless, he has made guest appearances on QI, Have I Got News for You and Would I Lie to You? He also guest presented an episode of The One Show alongside Alex Jones.