The F1 was obviously Project 1 for McLaren Cars. The longtail version was different enough that it might have been considered a separate project, but I am not certain of that.
I am not privy to all of the others unfortunately, but here's a couple more.
P5 was the car that Gordon Murray designed as McLaren's suggestion for the supercar they would build for Mercedes Benz when that relationship formed. The last photo is a sketch he shared during his discussion at Art Center in 2005 which has a very similar appearance to P5.
Mercedes own designers had sculpted the Vision SLR concept car at the same time which received considerable public interest after its unveiling and the rest, as they say, is history.