Dave Burland (Not very Dorset, I know) recorded Captain Ward and the Rainbow on vinyl. Trailer records - Dave Burland LER 2082 (1972)
I bought it years back, reduced because it had no sleeve, so I don't know what the cover looked like or if there were any sleeve notes.
As it is on the Trailer label, I presume it is another recording now unavailable.
Found details on web!
Quack!
Geoff.