The arrangement in this series reflects the arrangement of the materials prior to their deposit at Newcastle University, groupings which were likely to have been made by Charles and his family. As a result, letters from specific individuals or related to certain events may be found in multiple sub-series. The sub-series are as follows:

CPT/1/1 - Childhood and education CPT/1/2 - Professional papers and correspondence CPT/1/3 - Election material CPT/1/4 - Speeches given by Charles CPT/1/5 - Publications and pamphlets CPT/1/6 - Personal papers and ephemera CPT/1/7 - Letters to Charles from various correspondents grouped by date CPT/1/8 - Letters to Charles grouped by subject or author CPT/1/9 - Letters to Charles from George Otto Trevelyan and Caroline Trevelyan nee Philips CPT/1/10 - Letters to Charles from George Macaulay Trevelyan and Janet Trevelyan nee Ward CPT/1/11 - Letters to Charles from various family members