Unpublished letters

I am greatly enjoying my latest audio book.  It was published in 2012 and is a collection of letters from readers of the Daily Telegraph which were not published in the newspaper.  They are either witty, erudite or thought-provoking - in some cases all three.

I think there have been two earlier books.  Imagine one's chagrin if, not being published in the newspaper, one's letter was not considered worthy of being put in the book of unpublished letters and had been relegated to the slush pile!