Liam Byrne the Birmingham Hodge Hill MP is to resign from the Shadow Cabinet to stand for mayor in Birmingham.
The Shadow Work and Pensions Secretary will quit Ed Miliband's frontbench team if Birmingham votes yes in May's referendum on having an elected mayor.
Labour Group Leader Sir Albert Bore will also be joining Byrne's team.
Byrne said he plans to do everything he can to win back Europe's biggest authority for Labour, to secure a Yes vote in the Mayoral referendum, and then to fight for the Labour nomination.
The full report with Mark Gough: