This was an interesting find as I stumbled across it over a period of months, and the first couple of portraits I found were on their own and had no explanation next to them. I eventually stumbled across the main blurb just a week before the end of the exhibition. I didn’t manage to see them all, but you can find more information at Kit Oates.
The first batch (which were actually the last ones I found) were on the side of Gloucester House, Carlton Vale (NW6).
Prior to that I had also seen one on the side of South Kilburn Studios (Canterbury Road, NW6).
Finally we have the first two I spotted on Craik Court (Neville Close, NW6).