It's all kinda sketchy apparently with little or no original documentation:
Alf had it renovated and it was seen in its present state in about 1980; it was photographed for this web site in July 2010. Alf claimed that it had been made for his father, Hyman. The size 20-1/2" would have been about right for Hyman (who was not tall). The rear dropouts are not original as the right one is Campag with mech-eye (unknown in 1948). However, the head and seat lugs are certainly original, as no one would have built a frame with belled head lugs in 1980. Also the fork embellishment looks to be original 1948, as is the Chater Lea bb shell.
Claimed....However the head lugs....embellishments look to be original.
In all you can safely say it is a bit of the Hetchins story, be it 100% correct or a bit "embellished"
Wall hanger...eh.....If I had that kinda $, it would be my daily rider, I've always liked the looks of that frame.