In light of the currently unstable parliamentary position, this Constitution Society pamphlet on Mandates, Manifestos and Coalitions by Thomas Quinn from 2014 provides an analysis of some of the issues involved.
One of the most important assumptions in British politics since 1945 has been the existence of single-party, majority governments deriving their mandates from voters. The hung parliament and subsequent coalition government of 2010 therefore raised some difficult questions about the operation of the democratic system.
If no party enjoyed a parliamentary majority, what sense did it make to speak of mandates? What was the role of manifestos if no party possessed a majority to implement one in full? What was the democratic legitimacy of the comprehensive coalition agreement on public policy goals negotiated by the coalition parties after the election? What is the relationship between manifestos and coalition agreements? Can mandates follow from coalition agreements? Ultimately, is it necessary to rethink the basic relationship between voters, parties and governments in the UK political system.