Mainstream is the home for Labour’s radical realists - united by values, driven by change.

For everyone who knows that to transform the country and take on the populist right, Labour must offer a popular, principled and practical left politics for meaningful change.

Mainstream is serious about winning a democratic socialist future

We stand for the redistribution of power and wealth, the defence of human rights and dignity at home and abroad, the creation of a new political economy, and much more.

We believe that an open and inclusive Labour Party with a bold programme for change can achieve this - and we’re determined to make this happen.

What we stand for

Mainstream is a new network that will:

Push Labour to be bolder by organising within the party on key economic, social, democratic and environmental issues

that will help us to win the next election on terms that don’t just defeat the threat of national populism, but win hearts and minds for the long-term transformation of our country.

Provide an open and inclusive space for Labour members and supporters

to discuss and debate the vision, values, policy and electoral strategy of the party.

Publish research and hold events across the country

to generate more robust and transformative ideas.

Work to ensure the Labour Party internally is representative and democratic

so that the voices and views of all members are heard and heeded.

See who’s with us

Mainstream is a network led by its members for a better country

If you’re a Labour member or supporter, join Mainstream today to build and champion the vision, values, policy and strategy that Labour needs to make big change possible and win again in 2029.

Against the backdrop of a flatlining economy, electoral challenges approaching in May 2026, the threat of Reform to the right and a new party to the left, this project needs you.

Members will be invited to participate in exclusive member-only events and activities across the country. After an interim period, Mainstream will elect a Council to steer its course. Members will be entitled to vote and to stand in these elections.

Become a member of Mainstream today