Mandelson's position became untenable, only after incriminating Epstein files were going to be made public.
Mandelson knew these documents existed, and you can bet Starmer did. Putting the precautionary approach of "innocent until proved guilty", to one side, this has got to critically damage Starmer. If it weren't for other hot news topics keeping this from the front pages, Starmer would be packing his bags. (just my opinion)
And the gut-wrenching stuff, is that Mandelson's connections/activities were known about before he was gifted the dream job of Ambassador to the USA. I also reckon Mandelson got a hefty pay-off and final salary pension. Mandelson should probably be in jail.