2011 United Kingdom Alternative Vote referendum

The United Kingdom Alternative Vote referendum, also known as the UK-wide referendum on the Parliamentary voting system, was held on Thursday 5 May 2011 in the United Kingdom to choose the method of electing MPs at subsequent general elections. It occurred as a provision of the Conservative–Liberal Democrat coalition agreement drawn up in 2010 (after a general election that had resulted in the first hung parliament since February 1974) and also indirectly in the aftermath of the 2009 expenses scandal.

Source: Wikipedia — 2011 United Kingdom Alternative Vote referendum (CC BY-SA 4.0)