It turns out that we will have to scrap the plans to dig tunnel "Ernie" through the book sale boxes. The problem, as always, is what to do with the spoil from the dig.
The plan had been to borrow the method employed in the last unpleasantness (see fig. 1). The spoil would be deposited surreptiously around the library by our tying string around our trouser legs, filling our trousers with booksale books, wandering over to an unfrequented patch in a studiously nonchalent manner and then, when we were sure nobody was looking, releasing the string and dropping the books.
The plan foundered because having looked at the state of the booksale books none of us wanted any of them anywhere near our lily white skins.