This series contains desk diaries kept by John Platts-Mills, pocket diaries kept by John Platts-Mills, and pocket diaries kept by his wife Janet (nee Cree), and has been divided into three subseries accordingly: U DPM/6/1 - Desk Diaries of John Platts-Mills QC, 1947-1995; U DPM/6/2 - Pocket Diaries of John Platts-Mills QC, 1946-1997; U DPM/6/3 - Pocket Diaries of Janet Platts-Mills nee Cree, 1947-1992.

The diaries of John Platts-Mills record professional and personal appointments, visits, court cases, meetings etc. Please note that appointments and notes entered into these diaries have some overlap with material in other series, particularly the subject files series [UDPM/1 and U DPM/2] and the correspondence files series [U DPM/4]. The diaries of Janet Platts-Mills record mostly personal appointments, visits, events, etc although references are often made to painting and gallery viewings etc.