Hi George,
I cleaned off some more rust and crud off the forks and managed to find evidence of what appears to be original bronze blazing (other than where the repair was done). The tubes appear to be a tight fit in their respective holes and also, whomever originally brazed these forks together did a neat job and there is not much of a fillet to inspect. The Brazing does have a bit more of a "silvery" look to it compared to some bronzes I have seen which is why I thought I had better look at it more closely.
I agree with Leon and all traces of the "solder" used for the repair should be removed before brazing the parts back together.
(Interesting comment about Spelter Leon, I think Spelter is an alloy of Lead (Edit) Copper and Zinc (with Lead as a possible impurity) and Bronze of course is Copper and Tin, so different material, but they appear very similar. Spelter is used as a substitute for Bronze in some applications, although more softer and not as strong. Some confusion could happen as Leon states the term "Spelter" can be used as a name for Bronze!. After reading Leon's comment I thought "Would Douglas have used spelter (the Lead Copper / Zinc version) for this joint??" Probably not, but if I get a chance I will have a look into identifying Spelter from Bronze. During WW1 there was a shortage of Copper to make Bronze so possibly Spelter was used as a substitute for some applications? )
-Hutch
Edit: Corrections to add Copper as alloying element in Spelter.