I had a listen to your recording of Takemitsu, nicely played. I have not heard these pieces before. I wish I had a score of this piece, as it seemed there were some very shifty dynamics in the second piece, one chord would be piano and the next forte, which took me by surprise, though it made the already interesting chords highlighted even more. The first piece reminds me of Debussy's berceuse heroique, and the last diminished chord reminded me of the final chord in Hamelin's After Pergolesi.
I was curious about who Michael Vyner is so I found he was appointed Musical Director for London Sinfonietta in 1972. Perhaps Takemitsu was his student?
Enjoyed this litany