Related: Women Until August 2005, Britain in Europe was the main British pro-European pressure group.
Despite connections to Labour and the Liberal Democrats, it was a cross-party organisation with supporters from many different political backgrounds.
The organisation was launched in 1999 by Tony Blair, Gordon Brown, Kenneth Clarke, Michael Heseltine and Charles Kennedy.
The director of communications was the Scottish Liberal Democrat politician Danny Alexander.
On 17 August 2005, the group was wound up following the French and Dutch "No" votes on the proposed European Constitution.