Diane Abbott has promised to stay on as an MP for “as long as it is possible”, setting up a clash with Keir Starmer after a deal for her to retire from parliament broke down.
Abbott, the UK’s first female black MP, had been expected to make a “dignified exit” from parliament, after a near 40-year career, in an arrangement in which she was given back the Labour whip after an investigation into comments she made about racism.