To the best of my knowledge, somebody else was working on this for another company.
Having just watched all the b/w editions for the first time in about 50 years, yes, I can only agree. Such a shame the music doesn't seem to exist. There's some lovely cues on the monochrome editions that it would be lovely to have had. I was also amazed to discover what a very heavy reliance these shows (particularly the early ones) had on material from "International Detective" (and there's also a fair bit of "Gideon's Way" in some of the 1965 shows too).And for The Saint monochrome soundtrack as well, yes we got a terrific Network Saint colour OST release, but I would have preferred one for the earlier episodes.
All the best
Andrew