The sighting follows the release of new Epstein files detailing Mandelson's alleged "extensive social and business ties" to the paedophile financier.
Mandelson has been formally asked to give evidence to the US Congress concerning his relationship with Epstein, with a deadline of 27 February to respond.
Revelations include documents from 2009 suggesting Mandelson, as Business Secretary, shared sensitive information with Epstein on at least four occasions.
Following the explosive evidence, Mandelson quit the House of Lords on 3 February, leading to government turmoil and several resignations among the Prime Minister's advisors.
Bookmark popover
Removed from bookmarks