4/25 Updates:
I, again, don't know who keeps a log of these now, but Amphonic was an absolute dud. Not a single album on there matches tracks. So, we are back where we started... that is to say, no clue where to look. So, I'm going to ask around here - does anybody know any other labels that the BBC was pulling tracks from at this time? We know they were pulling from Patchwork/MCT, who have been searched, and have nothing that matches here. We searched Ariston, there's nothing new to find there for this tape. Presumably, Teichiku was only used for Himiko Kikuchi tracks - though I am not opposed to looking through their BGM collection again and seeing if there is anything worth finding there. And then, I know I suggested Bruton a while back, but never got to look through it. I could go through that again.
That's all for today. I don't know where to go, but I'm not leaving this so close to completion either. Even 1 new found track would exponentially increase the amount of time that can be taken up by HQ tracks. That's the ultimate goal here.
Also, there's two tracks - New Mexico and Brass Rass, afaik - that are on Apple Music, as vocal tracks, under the names "Sweetest Love" and "All Across The World". The instrumental is the same, and the label is "DRS 1206". Doing some discogs research, that album comes to be something worked on by ANOTHER Al Dickinson, completely unrelated to the one we knew prior, and was distributed in a few places - Memory Music, Palm Records, and Harmony, to name a few. The web is deepening here...