In case anyone is in need, two different sets of girder fork spindles are available from David Collwill engineering in Nottingham 01158371815.
One set is for 37-39 B Series bikes B20 to B26, the other is for 1940 and 1945 C10 and C11 (also fits B29 and B30).
I'll attempt to post pics of the two sets in following posts.
David may be able to supply them with fixed end nuts and captive spinner on the B series set and captive spinner and fixed nut on the damper spindle of the 1940 onward set.
If not you will need to provide the spinner (your old one or new one in Brass from Draganfly) and nuts (1/2" 2tpi from Nooky's, will need reducing to 1/4" thick) yourself and braze them in place.
The "Star" spring for the damper spindle is available from Ray Daniels.
David Collwill may also be able to supply the Bronze bushes.
Uploading pics failed, ask if more info needed...