How democratic is the UK’s proportional electoral system: the single transferable vote (STV)?

Patrick Dunleavy examines the proportional (PR) electoral system now used for smaller UK elections: the Northern Ireland Assembly, and Scottish and Northern Irish local councils. How has STV fared in converting votes into seats and fostering political legitimacy, under British political conditions? An Annex also discusses the list PR system used to elect European Parliament MEPs from 1999 to 2014, but now discontinued as a result of Brexit.