As part of the coalition agreement, both parties formally committed to holding a referendum on changes to the electoral system. (en.wikipedia.org)
As part of this, it can enact its own proposals for electoral reform, including changes to the electoral system and introducing votes at 16. (democraticaudit.com)
The referendum on changes to the electoral system is shaping up to be the political event of next year. (labour-uncut.co.uk)