I’ve dug through some more boxes, and found these:
First of all, another shot of the early machine, this is taken at the 1921 Ringland Hillclimb (just outside Norwich):
and two more shots of PW 5718:
This one is of yet another Scott, taken in 1955:
This one appears to be an earlier photo, captioned 1928, which may relate to the date of the bike rather than the photo, although Pop’s hair is darker, and there’s more of it than in the post-war photos!
Finally, two more photos from the Fifties: