LCER characterises the first-past-the-post voting system (FPTP) as "unfair and deeply flawed, leading to voter apathy, disaffection with politics, and parliaments which don't represent the people".

[2] Early supporters included academic Ron Medlow; Robin Cook,[3] Jeff Rooker and Martin Linton, who went on to be Labour MPs; and activist Mary Southcott,[4] who would later become LCER's parliamentary and political officer.

In 2010, incoming Conservative Prime Minister David Cameron announced a referendum on electoral reform in return for the support of the Liberal Democrats in a governing coalition.

[17] At the time, polling revealed that three-quarters of Labour members believed the party should commit to supporting proportional representation and adopt it as a policy.

[26][27] At the Labour Party Conference in September 2022, delegates from CLPs and trade unions voted overwhelmingly in favour of adopting proportional representation.

In the past, this included such high-profile figures as Mo Mowlam, Robin Cook, Paul Flynn, Clare Short, Tessa Jowell, Rhodri Morgan, Stephen Twigg, Oona King and Janet Anderson.

Former CEO of the Electoral Reform Society Ken Ritchie is the group's treasurer, whilst trade unionist Billy Hayes and former MP Willie Bain are also on the executive committee.

[39] Other current supporters include MPs David Lammy, Jonathan Reynolds, Tulip Siddiq, Stephen Kinnock, Alan Whitehead and John McDonnell.

Rather, it campaigns for the Labour Party: LCER bases its support for proportional representation on the belief that PR systems are more democratic than FPTP, but also on evidence that PR voting systems are associated with societies with higher levels of social and economic equality; with higher levels of public spending and redistribution; and with a lower propensity to engage in violent conflict.