Two by-elections set for same day as UK-wide polls
Labour will defend two parliamentary seats on 5 May - the same day voters across the UK go to the ballot box.
The contests in Ogmore and Sheffield Brightside & Hillsborough will clash with local council elections across England, as well as polls for the Scottish Parliament and Welsh Assembly and the race to become London Mayor.
The Ogmore by-election has been caused by the resignation of sitting MP Huw Irranca-Davies, who is standing for the Welsh Assembly.
Mr Irranca-Davies won the rock-solid Labour seat with a 13,043 majority at the last election.
Meanwhile, the Sheffield Brightside & Hillsborough seat, which was vacated by the death of Harry Harpham, will be contested for Labour by his widow Gill Furniss.
Mr Harpham, who replaced David Blunkett as the seat’s MP last May, died of cancer in February at the age of 61.
He won a majority of 13,807, with Ukip in second place, the Tories in third, the Lib Dems fourth and Greens fifth.
Labour are expected to hold both seats, but critics of Jeremy Corbyn will be looking to see whether the party's shift to the left under his leadership is turning off their traditional supporters.