The successful 12 were revealed to viewers on Sunday night's show and here are their details.
Andy Williams, 22, from Newport, South Wales:
Andy lives at home with his mum, dad and older brother Lee, with whom he runs an asbestos removal company. Andy previously auditioned for the show, and was rejected, aged 19. He spent three years practising his dance moves and is now keen to demonstrate his skills to Brian Friedman. He said the best thing that's happened to him is "Meeting my girlfriend. She’s amazing".
Leon Jackson, 18, from West Lothian, Scotland:
Leon, a Gap sales assistant, is an only child brought up by his mother. They have struggled with money and Leon is desperate to win to give them both a better life. Leon only began singing in January and has been a regular karaoke fixture since. Leon loves contemporary jazz and his influences are Michael Bublé and Jamie Callum. Leon's claim to fame is that he's "met Atomic Kitten".
Rhydian Roberts, 24, from Powys, Mid Wales:
Rhydian is currently taking vocal studies at university in Birmingham, but was brought up in Powys where his family live. He is a classical baritone singer and has had vocal training for seven years. He sings popular opera similar to Russell Watson and Il Divo. If he released an album he’s convinced the “whole of Wales would buy it”.
Alisha Bennett, 23, from Wembley, London:
Alisha, a gym receptionist, was inspired to audition after watching Leona Lewis win last year. She lives down the road from the studio and, seeing crowds queuing every week, thought, "I want some of that". Alisha’s music background is based around her church gospel choir and she has been having singing lessons for the last year. She is close to her mother Sharon and describes them as an "Ab Fab" pair. Alisha's most overused phrase is "for real".
Kimberley Southwick, 19, from Tamworth, Staffs:
Kimberley lives and works in her parents’ pub, The Fox. She loves country music and performs at the pub's karaoke regularly. She attended Italia Conti for one year but left because she didn’t enjoy it and has previously appeared on Michael Barrymore's My Kind of People. A self-confessed "absolute nutter" but also "very kind, happy and clumsy".
Emily Nakanda, 15, from North London:
Schoolgirl Emily was the first ever 14-year-old to audition in front of the judges where she sang 'Almaz' by Randy Crawford. They were bowled over, Simon Cowell declaring her performance demonstrated why the age limit, controversially, was lowered. She lives with her mother, stepfather and older brother Terry. Last year Emily was seriously ill with peritonitis so her family feels "very blessed to have her with us". She has sung in school and church choirs and loves all music. Asked why she entered she said: "I think that everyone is put on earth for a purpose and I think that I have been given something to do and I’ve not yet done it."
Beverley Trotman, 37, from Luton, Beds:
Primary school teacher Beverley adores her job but has spent her spare time singing in choirs since the age of four. She is a member of the award-winning Kingdom Choir, which has performed backing vocals on X Factor in the past. She lives with husband Jonathan and their two children Tianna, 12, and Luke, 10. Beverley has a large family and one of her nephews, Leon Barnett, plays for West Brom. Her favourite food is strawberry cheesecake flavour ice cream.
Niki Evans, 34, from Tamworth, Staffs:
Niki, who works as a school catering manager, applied after finding an application form meant for her in her recently deceased father's belongings. Her father had been the driving force behind her attempt at a singing career so she is taking part in his honour. Niki has been in bands since the age of 12 but, though she got a record deal at 16, never achieved chart success. She is married with two boys, 12-year-old Morgan and Jonah, 10. Admits to a past crush on Jon Bon Jovi.
Daniel De Bourg, 31, from London:
Originally trained at The Royal Ballet, Daniel worked as a professional dancer for four years but had to give up after a knee injury. In 2001 he worked with R Kelly but, after label Dreamworks was bought out, the results were never released. Daniel then took up teaching dance and ballet, while doing some modelling. He lives with friends and has a three-year-old son, Theron, who he sees every week. Says he is "creative and destructive".
Same Difference - Sean and Sarah Smith, 21 and 18 respectively, both from Portsmouth:
The brother-and-sister duo live with their mother, father and grandmother. Simon has described them as "the most annoying pair of people I've met" because they were so smiley. Sean has performed on cruise ships and in pantomimes while Sarah attended the Italia Conti performing school. She has done modelling but singing is her passion. Sarah and Sean perform together at an old-peoples' home and their dream is to entertain the world.
Futureproof - Aaron Delahunty, 19, Adam Chandler, 21, Matthew Protheroe, 17, Richard Wilkinson, 23, and Sean Rumsey, 20:
The boys were originally rejected as solo performers at Bootcamp but were given the opportunity to form a boyband. They are from across the UK and are a mixture of professional singers and keen amateurs.
Hope - Charlie Mole, 23, Emily Biggs, 17, Raquelle Gracie, 20, Leah Lauder, 20, and Phoebe Brown, 16:
Hope hail from around England and include full-time entertainers, a student and a beauty therapist. They were united at Bootcamp. Simon likes their feistiness but wants them to lose their "attitude".