Green was a school clerk at the Examination Schools in Oxford. In 2012 he discovered a disordered bundle of papers on the top of one of a number of sacks of waste paper in the basement of the school. They were loosely tied with a red string and on the outer sheet was inscribed in large Lombardic capitals: NOTION CLUB PAPERS.
Later, it was discovered that the papers reported approximately one hundred meetings of a certain discussion group. The meetings took place between c. 1980 and 1990, and in 2014 he published the work.