The UK Co-operative Party
The Co-operative Party is a centre-left political party in the United Kingdom committed to supporting and representing co-operative principles. The party does not put up candidates for UK elections, instead, Co-operative candidates stand jointly with the Labour Party as "Labour and Co-operative Party" candidates. Although a sister party of the Labour Party, the Co-operative Party is legally a separate political organisation, and members of the Co-operative Party do not have to join the Labour Party although they are not permitted to be members of another political party.
In its formative years the Co-operative Party was almost exclusively concerned with the trading and commercial problems of the co-operative movement. Since the 1930s it has widened its emphasis, using influence gained through strong links with the political and commercial left to spread what it sees as Co-operative ethos and moral principles. The basic principles underpinning the party are to seek recognition for co-operative enterprises, recognition for the social economy, and to advance support for co-operatives and co-operation across Europe and the developing world. The party stands for a sustainable economy and society, a culture of citizenship and socially responsible business represented by the practice of retail and industrial co-operatives. The Co-operative Party seeks to advance its agenda through the Parliamentary Labour Party, with whom it shares common values.
See website here