Keir Starmer's allies are plotting an autumn of revenge on Andy Burnham in response to last week's brutal reshuffle and unfunded policy announcements.
They are vowing to hold the new Prime Minister's feet to the fire over his stated ambition to unleash the biggest changes in UK politics for 40 years.
Their efforts will include a 'forensic focus' on ensuring Mr Burnham sticks to the party's 2024 manifesto on tax.
And The Mail on Sunday can reveal Sir Keir's loyalists are eyeing up a new parliamentary group to ensure his successor maintains 'economic competence' in the run-up to the Budget.
Attention is also moving to the upcoming election of a new Labour general secretary this September, with pro-Starmer allies on the party's National Executive Committee able to pick someone who would make Mr Burnham's life harder when it comes to candidate selection and party discipline.
