Oona King

'If you ever see me dancing on TV," Oona King wrote in her diaries, published after the former Labour MP for Bethnal Green and Bow lost her seat in the 2005 general election's bloodiest battle, "I can only apologise in advance." In that first year out of work, she turned down offers to appear on I'm a Celebrity ... Get Me Out of Here and host her own chat show. The only reality TV programme she "secretly yearned to do," she writes, was Dancing On Ice. Her long-suffering husband joked he would divorce her if she did it. Everyone else said it would "irrevocably ruin" her career.

Two weeks from now, Labour will have a new leader. Yet his – and it's usually always "his" – biggest electoral test before winning a general election will be winning London in 2012, and using that as a springboard to beat this Tory government – a government that is shameless about hitting the poorest hardest.

Labour members and trade unionists have to decide who can best beat Boris Johnson – Ken Livingstone or myself? Who can best win back the voters Labour lost in outer London, in parliamentary seats like Enfield North and Brent Central? Equally important, it's about who best represents the future for the Labour party, and who can inspire a new generation of Labour party members to join our movement.

Ken Livingstone is planning to bring his former rival Oona King into City Hall if he is elected London mayor next week. Lady King will be the young people's champion implementing Labour's manifesto for young Londoners, if Livingstone beats Boris Johnson on 3 May, though the status of her advisory role remains unclear at this stage.

The surprise announcement, a week before polling day, comes 19 months after Livingstone promised to make use of King's talents after he beat her in Labour's selection process for a mayoral candidate.

Livingstone said of his decision to bring the former MP for Bethnal Green and Bow into the fold: "I was consistently impressed by Oona's ideas to help young Londoners during the Labour selection contest. I told her then I'd steal her best policies – now I've gone further, asking her to lead on our work with London's young people and I'm delighted that she's agreed.

"Oona will form an integral part of a fresh Labour administration at City Hall, as we work together to stand up for Londoners being hit hard by a Tory onslaught."