>>3944646 (lb) [notable]

>March 24, 2016 – Papadopoulos, Mifsud, Olga Polonskaya and unknown fourth party met in a London cafe.

Any sauce confirming four people at this meeting? All info I've heard/read has only 3 at the meeting: PapaD, Mifsud and Polonskaya [aka Vinagradova].