Initially I too thought that perhaps the bonnet may have been a J type but 2571 is/was a two tone Old Ivory and Light Fawn J2 .I do not know how that colour was stamped on the hinge but I am sure it was not 01 unless the code was OI for Old Ivory. As said it was not well lit and the eyes are aging.
The other two cars are obviously P types 412 and 1641 , but the third a mystery.
Don'tJ and p bonnets have different louvre patterns? I think the P just has them forward of the firewall... if so telling one from the other should be simple if the sides are there of course. Not sure how the lengths compare...