The Sloth was released on :-
The Bestiary of Flanders and Swann
1964 Parlophone PCS 3026...Available from EMI:
At the Drop of a Hat.
At the Drop of Another Hat.
The Bestiary of Flanders & Swann
All Three as a Box Set, The Complete F&S, CDFSB 1 CDS 7974642.info at
http://www.sanger.ac.uk/~mnw/Flan
Andy