Thanks, Flaxton. Yeah, I think Embryo also showed up on "Works" but I'm not sure it's the exact same mix (but it may be...I haven't checked). I've accumulated those 45s over time and for a long time I only had them on CD...
Picnic has some other good stuff on it too by other Harvest bands (and Syd Barrett, although his song is taken from his album and not rare...) Overall it's a good compilation, and the cover is great!