It was some kind of piecemeal parody book. It was hysterical.
How much of it do I remember? Two bits.
One was (I believe) a stand-up nightclub comedy bit as performed by the Green Knight (of “Sir Gawain and the…” fame).
The other was a series of parodies of “Trees” that ran through the book (“I think that I shall never see/A poem lovely as a tree” etc.)
Given these two, very vaguely remembered fragments, does this ring any bells with anybody? You will be my hero for the day, particularly if I can find it on Amazon.