- Reality Subtext: At time the book was written, there was an outbreak of disease amongst English livestock and their movement and sale was highly restricted and regulated — hence why the piglings need "licenses" to leave the farm and go to market.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/TheTaleOfPiglingBland
FollowingTrivia / The Tale of Pigling Bland
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