Labour peers are threatening to wreck David Cameron's flagship bill on voting reform, with another series of all night sittings in the Lords this week.  Prime Minister urged to appoint safest pair of hands as he faces renewed trouble from Tory right-wingers and Labour MPs.  The referendum on changing the voting system could be delayed until the autumn if peers taking part in a round-the-clock attempt to block it from becoming law are successful.  Year zero of Cameron-Clegg revolution and we gathered in the Foreign Office's Durbar Court.  Peers have vowed to debate around the clock ‘night after night after night’ this week in order to meet a timetable to hold a referendum on electoral reform this May.  Nick Clegg’s plans to reform the House of Lords are “wantonly destructive”, Baroness Boothroyd has said.  Peers will be ordered to sleep in make-shift dormitories in the House of Lords on Monday night as David Cameron attempts to push through legislation on voting reform.  Nick Clegg's plan for a May referendum on changing the electoral system is being threatened by a power-struggle in the House of Lords.  The Oldham by-election will be followed by a join-the-dots of political horrors - but ministers must keep faith in their strategy  Telegraph View: To be a truly transformative Prime Minister, David Cameron must take his party with him.  The Lib Dem leader's breathtaking retreat from principle is reaping its just reward, argues Simon Heffer.  The referendum is a choice between sticking with our current system or replacing it with the obscure, unfair and expensive Alternative Vote, writes Lord Reid.
The UK will go to the polls on May 5 2011 to vote in a referendum on whether to change the voting system used to elect Westminster MPs from First Past the Post to Alternative Vote (AV).