After shifting the large stone plinth and accessing the tunnel, look for this item at the far right end before climbing the ladder.
"A pay book belongingg to a British soldier. It also contained practical details such as a last will and testament form, as well as thenames and addresses of close relatives to contact in the event of death. The book also served as a
regulations guide to good conduct, advising men: "In this new experience you may find temptations both in wine and women. You must entirely resist both.""