I just did the greenwich one. That was fun - thanks. One complicating factor is that they re-use faces in the lineups, so you end up recognizing people from two faces ago. (intentional, no doubt).
I have aphantasia (to a degree). For example, I had difficulty recognizing my mother when she dyed her hair a few years ago.
https://www.facebook.com/notes/blake-ross/aphantasia-how-it-...