The collection includes personal documents and honours (PJGG 1); general correspondence (PJGG 2 and 12); material relating to India including finance papers (PJGG 3), political papers (federation and defence) (PJGG 4), miscellaneous reports (PJGG 5), War Office papers about India (PJGG 8); Lady Grigg's correspondence (PJGG 6 and 7); War Office correspondence (PJGG 9); Committee papers (PJGG 10); literary material (PJGG 13-15).

Perhaps the most interesting papers are those concerned with India (sections 2-8), which include those acquired during Sir James's appointment as Finance Member of the Viceroy's Council (1934-1939) and questions about India that arose when he was Permanent Under-Secretary of State for War (1939-1942). An interesting background for the earlier period is provided by Lady Grigg's letters to Dr Thomas Jones (section 7).

Unhappily, little survives from Sir James's time as Secretary of State for War (1942-1945) except some general correspondence. A notable exception is his lively correspondence with Field-Marshal Bernard Montgomery (sections PJGG 9/8, PJGG 9/9), with whom he was on the best of terms.

During Grigg's term as Finance Member of the Viceroy's Council, the Viceroy was known constitutionally as Viceroy, Governor-General, and Crown Representative. The designation that appears on the document has been retained.