This is likely to appeal just the most dedicated Kink-o-philes, but from what I've heard it's pretty decent stuff.
I'm talking about the last Dave Davies' comp, "Decade", made up of 13 unissued songs that Ray's brother recorded during the 70s (from 1971 to 1979, the year prior to his first proper album). Some of the tunes have been retouched recently by Dave and his son at the studio, but it isn't that apparent.
Of course, it's not in the same league as DD' 60s stuff ("Hidden treasures" is still the compilation to own), but as I said it's not half bad and as it's unlikely that 13 unreleased golden-era Kinks songs will appear in the next future, this will have to do.
https://www.allmusic.com/album/decade-mw0003203460