Question Time, the BBC's premier political programme chaired by David Dimbleby, hosted a European election special in Sheffield on 20 May. Joining him for the interactive debate were Patricia Hewitt MP, Michael Ancram MP, Sir Menzies Campbell MP, Jean Lambert MEP and Robert Kilroy-Silk.
PATRICIA HEWITT MP
Title: Trade and Industry Secretary and Minister for Women
Career: Patricia Hewitt gained rapid promotion to the cabinet in 2001, four years after being elected MP for Leicester West.
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Ms Hewitt recently co-launched Labour's European election campaign. She denied the party was using negative campaign tactics when it placed a newspaper advert which criticised Michael Howard's record.
She has also held the post of minister for small business and e-commerce, and as economic secretary she helped win compensation for victims of pension mis-selling.
MICHAEL ANCRAM MP
Title: Shadow Foreign Secretary and Conservative Deputy Leader
Career: Michael Ancram has said his party is determined to stop Tony Blair railroading in an EU constitution.
The Tory heavyweight, who stood as a candidate in his party's leadership contest in 2001, supported Michael Howard's campaign to succeed Iain Duncan Smith last year.
As a junior Scottish Office minister he helped introduce the poll tax to Scotland and as party chairman helped run the Conservatives' 2001 general election campaign.
SIR MENZIES CAMPBELL MP
Title: Liberal Democrat Deputy Leader and Foreign Affairs spokesman
Career: Sir Menzies Campbell has been a persistent critic of the war in Iraq, and wants a full-scale inquiry.
One of the Lib Dems' longest serving and most prominent MPs, the big hitter surprised many by not standing in the party's leadership contest against Charles Kennedy in 1999.
Sir Menzies, who was an athletics star in his youth and competed as a sprinter in the 1964 Tokyo Olympics, returned to parliament last year after recovering from cancer.
JEAN LAMBERT MEP
Title: Vice President of the Green group in the European Parliament
Career: Jean Lambert and her colleague Dr Caroline Lucas are Britain's first Greens elected to the European Parliament.
In a bid to attract voters, the Greens have released a CD featuring a speech by Ms Lambert set to dance music. She is opposed to the war in Iraq and has addressed anti-war rallies across the country.
The former primary school teacher has gone on record to say it is acceptable to break the law on a point of principle if a person is willing to accept the consequences of their action.
Title: UK Independence Party
Career: Former Labour MP and chat show host Robert Kilroy-Silk helped launch UKIP's European election campaign.
He hosted Kilroy for the BBC for 17 years but quit in January over a Sunday Express article in which he called Arabs "suicide bombers" and "limb amputators".
Mr Kilroy-Silk was a Labour MP for 12 years and from 1974 represented the Merseyside constituency of Ormskirk, which later became Knowsley North. In 1983 he left politics to pursue his career in television.
BBC One's Question Time is broadcast on Thursdays at 2235 GMT.