As Starmer apologises for believing Mandelson’s ‘lies’, just how damaging will the latter’s links to Jeffrey Epstein be for the PM’s own reputation? John Harris and Kiran Stacey discuss the latest. Plus, the mood on the ground from the Gorton and Denton by-election

• Please send your questions and messages for Pippa Crerar, Kiran Stacey and John Harris to politicsweeklyuk@theguardian.com