Division number 51 – in the House of Commons on 6 Medi 2010.
A majority of MPs agreed and wedi pleidleisio in favour of a referendum on using the Alternative Vote system in general elections and for parliamentary constituency boundary changes which would have reduced the number of MPs from 650 to 600.
Eisiau deall mwy am y bleidlais hon? Darllenwch y ddadl yr oedd yn rhan ohoni.