Division number 79 – in the House of Commons on 9 Chwefror 2010.
A majority of MPs disagreed and wedi pleidleisio in favour of a referendum on using the alternative vote system for parliamentary elections being held no later than 31 October 2011.
Eisiau deall mwy am y bleidlais hon? Darllenwch y ddadl yr oedd yn rhan ohoni.