Sir Reg Empey is leader of the Ulster Unionist Party
The Ulster Conservatives and Unionists (UCU) electoral link-up between the UUP and Conservatives was forged in 2008.
Out of its 17 general election candidates, 15 come from the Ulster Unionist Party and two from the Tories.
In the last general election, the UUP was reduced from five sitting MPs to one.
Lady Sylvia Hermon was elected in North Down in 2005, but she has declined to represent UCU as she does not support the Conservatives.
Rodney McCune worked as a parliamentary assistant for former Ulster Unionist MP Martin Smyth. He is the chairman of the UUP's Westminster Association in London, and works as a criminal barrister. In the 2005 general election, he came third in North Antrim with 14.5% of the vote.
Trevor Ringland is a former Ireland rugby international. He works as a solicitor and is a member of the Policing Board and co-chair of the anti-sectarian campaign group One Small Step. It is the first time he has stood as an election candidate.
Lesley Macauley is a community worker from Portstewart. She has been a youth worker in Belfast's Shankill Road and a charity fundraiser. She runs a training and consultancy business specialising in personal development, community development and peace-building. This is her first election.
FERMANAGH AND SOUTH TYRONE
The UCU and DUP have withdrawn in favour of Rodney Connor, who is standing as an independent.
David Harding is a Scottish-born vet and Presbyterian elder. He was co-opted onto Coleraine Borough Council last year. This is the first time he has stood in a general election.
Daphne Trimble is a qualified solicitor and long-serving Ulster Unionist Party activist. She lives in Lisburn and is married to former UUP leader Lord Trimble. Mrs Trimble has also served on the Northern Ireland Human Rights Commission. She is making her debut as a Westminster candidate.
Sandra Overend lives near Bellaghy and has worked for 12 years as office manager for UUP assembly member Billy Armstrong. She is the party's women's development officer. It is her first general election.
NEWRY AND ARMAGH
Danny Kennedy is the UUP deputy leader and an assembly member for Newry and Armagh. A former British Telecom employee, he lives in Bessbrook. In the last general election, he came fourth in the constituency with 13.9% of the vote.
Irwin Armstrong is one of two Conservative Party members to be selected by UCU. He is a qualified accountant who worked for the Northern Ireland Development Agency before setting up a management consultancy. An entrepreneur, in 2005 he founded CIGA Healthcare which supplies the NHS and exports home-testing medical kits to 40 countries. This is his first election.
Fred Cobain is an Ulster Unionist assembly member and chairman of the Stormont committee for regional development. He is a trade union activist. He works with the Simon Community and the Northern Ireland Council for the Homeless. In the 2005 general election he came fourth in North Belfast with 7.05% of the vote.
Ian Parsley is one of two Conservatives selected to represent UCU. A former Alliance Party member who stood as its European election candidate last year, Mr Parsley joined the Conservative Party in September 2009. He runs his own public relations firm. His partner is South Belfast UCU candidate Paula Bradshaw.
Sir Reg Empey succeeded David Trimble as Ulster Unionist leader in June 2005. His family were retailers, and his uncle was a Stormont Ulster Unionist MP. He has been involved in unionism since his student days and has been a member of successive Ulster Unionist negotiating teams since the Brooke-Mayhew talks in the early 1990s. Knighted in 1999, he has served as Stormont minister for enterprise and is currently employment and learning minister.
Paula Bradshaw is a community worker in the Village area of south Belfast. She joined the UUP in 2004, and this is her first time standing in a general election. A graduate of government and law, she is a member of a number of committees, including the Village Community Relations Working Group and Newtownabbey District Policing Partnership. She lives in Jordanstown. Her partner is North Down UCU candidate Ian Parsley.
John McCallister is an assembly member and a member of its health and education committees. He is a former Young Farmers' Club president and worked for former UUP leader Lord Trimble in his 2005 Westminster election campaign. This is his first time standing for election at Westminster.
Mike Nesbitt is a former presenter of UTV news. He began his career as a sports presenter at the BBC. At UTV, he presented its evening news programme for 10 years before leaving in 2006. He became a Victims' Commissioner in 2008. Earlier this year, he left the commission and joined the UUP.
Harry Hamilton is best-known as the Freddie Mercury impersonator Flash Harry. He also works as a business development manager in the food service sector. He is secretary and election officer of the UUP's Upper Bann Association, and this is his first general election.
Bill Manwaring is a former journalist who wrote for newspapers and edited the publications Easy Access, Body Thoughts and Nightowl. He runs his own leisure business and works for the Simon Community homeless charity. This is his first time standing for election to Westminster.
Ross Hussey first became an Ulster Unionist councillor in Omagh in 2005. He came to wider attention last September when his young party colleagues mocked up an election poster pointing out his alleged resemblance to the Family Guy character Peter Griffin. He has been a member of the party since 1997. This is his first general election.