| RefNo | Title | Date |
| NL/32/4 | Sir Edward Grey letters to Katherine Lyttelton | 1909-1910 |
| NL/32/5 | Sir Edward Grey letters to Katherine Lyttelton | 1911-1912 |
| NL/32/2 | Sir Edward Grey letters to Katherine Lyttelton | 1907 |
| NL/32/6 | Sir Edward Grey letters to Katherine Lyttelton | 1913-1915 |
| NL/32/8 | Sir Edward Grey letters to Katherine Lyttelton | 1920-1933 |
| NL/32/1 | Sir Edward Grey letters to Katherine Lyttelton | 1896-1906 |
| NL/32/3 | Sir Edward Grey letters to Katherine Lyttelton | 1908 |