I can keep this one simple - if you enjoy British folk, particularly the darker, slightly psych / mysticism tinted stuff, you cannot go wrong with this.
COB made two records, this and Spirit of Love, and both are ...perfect! There is not one thing I'd change in either of them, it bears testament to the band's clarity of vision while clearly fitting the mood and preoccupations of the time (or so it seems, I wasn't around till '77...) and there is no self-indulgence. Whereas I find ISB hard-going, COB's music never has a note too many or an over-phrased lyric. 'Spirit' is a much simpler affair and is musically lighter; as the musicians say in the sleeve notes here, the harmonium and clarinets tend to unify the sound on Moyshe, creating an atmosphere like in an old, empty church.
It's important to point out that this sounds like three individual talents merging into one sound, it is not uniquely "Clive's band" other than in title, I imagine to cash in on the ISB connection - this was (manager) Jo Lustig's idea, of course. As was the slightly incongruous 'single'.
I don't think they come close, but for other good, lesser-known albums from this period, check Mellow Candle, Forest and Caedmon out, and Comus if you can handle the darkness. But along with Comus, this is the only one that gets six stars.