Lewis Carroll’s The Hunting of the Snark (1876) has been published “with nine illustrations by Henry Holiday”. But there are ten illustrations. One possible explanation: The Ocean-Chart (aka the Bellman’s map) has been made neither by Henry Holiday nor by Joseph Swain, but by a typesetter.
In the more recent British history, the map has been used by Britain’s contemporary Bellmen before 2016-06-23 to present their understanding of the impact of the Brexit to the rest of the crew. Admittedly, by now the majority of Britains understand the trouble they put themselves into. But as pride and face-saving of course is much more important than something profane like a healthy economy and rational thinking, that map won’t be updated.