Not much I can say about Datblygu that I haven't said already, all courtesy of Medwyn's great bequest of which this CD forms yet another part (possibly the last, but I could be wrong). Wyau and Pyst were the first two LPs by the band. In my view they're not quite as good as the third album, Libertino, but nowadays all three come together, obviating any tricky purchasing choices.
MusicBrainz entry for this album
Wikipedia entry for this album
Rate Your Music entry for this album
Listen to this album in full at Last.fm