Are you sure that the forks belong to the frame? I thought that headsets of that clip type were pre-war. Looking at your pcs, that one seems to be a bit of mix and match.
I wonder if somebody has done a bit of DIY modernisation somewhere along the line? I think of Mafac Racers -f that's what they are - as being 1950's early 1960's. That arrangement with a drilled stem to replace the front centrepull hanger is surely a DIY job. (I did something similar myself, thinking it was a good idea to save weight, but it was a pita.) I suspect that the composite arrangement of the headset here has made a proper hanger hard or impossible to fit.
The covered rear brake cable, held in place with the three clips is very 1960's. I'd have said that the Williams chainset - though still available in the 1960's - Professor Eddywilly ads come to mind - was really typical of an earlier time.
I think those mudgurad eye - part way up the seatstays / forkblades is again, an earlier fashion. It's not clear to me if the front ones are brazed on or something added; if it's the latter that would suggest the frame and fork weren't originally together.
edit: I've just found this about dating Williams cranks etc.http://www.classiclightweights.co.uk/wi ... ating.html
Further edit: this is part of the 1932 Chater Lea catalogue on Classic Lightweights.
It illustrates a headset clip and further down some of those elongated mudguard eyes, which appear to be intended to be sold loose, rather than as framebuilding parts (which are listed further up.)http://www.classiclightweights.co.uk/co ... -comp.html