Birmingham MP Shabana Mahmood is to oversee efforts to ensure Labour ends its losing streak and starts winning elections again, in her new role as Labour's National Campaign Co-ordinator.
She said: "Part of my role is to get every part of our elections machine working effectively, to put together a winning platform for Labour candidates all across the country."
And she said Labour would hold a review of all its policies.
Ms Mahmood, MP for Birmingham Ladywood, was given the key role in a controversial reshuffle of Labour leader Keir Starmer's team over the weekend.
It follows Labour's defeat in the Hartlepool by-election, where the party lost a seat it had previously held since 1974. Labour also failed to make gains in the West Midlands Mayor election, where Conservative Andy Street was re-elected, and in the Tees Valley mayoral election.
There were gains for Labour in the West of England and Cambridgeshire and Peterborough mayoral elections, and the party won the West Yorkshire Mayoral election.
Ms Mahmood is one of two Birmingham MPs in the Shadow Cabinet. The other is Birmingham Edgbaston MP Preet Kaur Gill, who retained her position as Shadow International Development Secretary.
There had been reports that Birmingham Yardley MP Jess Phillips would be promoted, but this did not happen. It's possible that Sir Keir was forced to revise some of his plans, following a backlash this weekend over news that Deputy Chair Angela Rayner was to lose her role as Labour Chair.
Ms Phillips retains her role as Shadow Minister for Domestic Violence and Safeguarding - a front bench role, but not in the Shadow Cabinet.
Ms Mahmood told BBC Breakfast: "I am in no doubt as to the amount of work that needs to be done."
She said Labour would launch a policy review. "There has to be a policy review process which we are now going to embark on together, as a movement, to try and work out what is the programme that we need to be offering the country."
Ms Mahmood's first test will be a by-election in the Yorkshire seat of Batley and Spen, which follows the election of the current MP, Labour's Tracy Brabin, as West Yorkshire mayor.
She said: "It is no doubt going to be a big test. It is an important by-election for us
“We have just won in West Yorkshire and that is the base on which we have to build."
She also defended the weekend reshuffle, which has been privately criticised by some Labour MPs.
"The decisions around personnel are for Keir Starmer, as the leader of the Labour Party, to make, and they are his decisions alone,” Ms Mahmood told BBC Breakfast
“What anybody else thinks does not matter.
“Keir has appointed his team, as he has the right to do, and it’s the job of all of us to work together to try and find a way to build a winning voter coalition that can span across the country."
There was a backlash over the weekend when it emerged Labour Deputy leader Angela Rayner was to lose her position as party chair. The original intention appears to have been to demote Ms Rayner, but this sparked an angry backlash within the party.
Sir Keir eventually gave her a beefed-up role as Shadow First Secretary of State (effectively making her shadow deputy prime minister), Shadow Minister for the Cabinet Office and Shadow Secretary of State for the Future of Work.
The current Labour Shadow Cabinet in full
- Deputy Leader, Shadow First Secretary of State, Shadow Chancellor of the Duchy of Lancaster and Shadow Secretary of State for the Future of Work: Angela Rayner
- Party Chair & Chair of Labour Policy Review: Anneliese Dodds
- National Campaign Coordinator: Shabana Mahmood
- Shadow Chief Whip: Alan Campbell
- Shadow Chancellor of the Exchequer: Rachel Reeves
- Shadow Chief Secretary to HM Treasury: Bridget Phillipson
- Shadow Secretary of State for Foreign & Commonwealth Affairs: Lisa Nandy
- Shadow Secretary of State for the Home Department: Nick Thomas-Symonds
- Shadow Secretary of State for Justice: David Lammy
- Shadow Secretary of State for Defence: John Healey
- Shadow Secretary of State for Health and Social Care: Jonathan Ashworth
- Shadow Secretary of State for Business, Energy and Industrial Strategy: Ed Miliband
- Shadow Secretary of State for Work and Pensions: Jonathan Reynolds
- Shadow Secretary of State for International Trade: Emily Thornberry
- Shadow Secretary of State for Education: Kate Green
- Shadow Secretary of State for Digital, Culture, Media and Sport: Jo Stevens
- Shadow Secretary of State for Environment, Food and Rural Affairs: Luke Pollard
- Shadow Secretary of State for Communities & Local Government: Steve Reed
- Shadow Secretary of State for Housing: Lucy Powell
- Shadow Secretary of State for Transport: Jim McMahon
- Shadow Secretary of State for International Development: Preet Gill
- Shadow Secretary of State for Wales: Nia Griffith
- Shadow Secretary of State for Scotland: Ian Murray
- Shadow Secretary of State for Northern Ireland: Louise Haigh
- Shadow Secretary of State for Women and Equalities: Marsha de Cordova
- Shadow Leader of the House of Commons : Thangam Debbonaire
- Shadow Attorney General: Charlie Falconer
- Shadow Secretary of State for Mental Health: Rosena Allin-Khan
- Shadow Secretary of State for Child Poverty: Wes Streeting
- Shadow Secretary of State for Young People and Democracy: Cat Smith
- Shadow Secretary of State for Employment Rights & Protections: Andy McDonald
- Shadow Leader of the House of Lords: Angela Smith
- Opposition Chief Whip in the House: Tommy McAvoy
