The files are arranged in approximately chronological order but many spread over several years and there is considerable overlapping. The recognisable names are filed alphabetically within each file and the unidentified ones at the end. The files are substantially in the same order as received from the donor and presumably as filed by Grey.
The content of the files changes after 1939 when Grey left the editor's chair at The Aeroplane and concurrently World War II began. Up to this time only incoming letters have been retained by Grey but many contain vivid accounts of World War I experiences of his friends. Sir Winston Churchill seems to have ensured that Grey himself was not called up. Later Grey has a secretary and the files contain the corrected draft of his own letters. He used a dictating machine and his letters are long, rambling and conversational but gratefully received and many of the replies are equally extensive.
Many of the official letters from people in high places are acknowledgements of congratulations on decoration or promotion or the receipt of some special publication. Grey missed no opportunity to keep open his lines of communication and some of the replies are diplomatically phrased. On the other hand there are many unsolicited expressions of friendship and gratitude. He responded energetically to problems offered to him for action such as the living conditions of the WAAFs during the war. The condemnations are very loud and clear and maybe Grey would not have wished them to be retained for posterity as he did offend many people.
Grey was essentially a journalist and not a historian and the post 1939 files illustrate his own personality rather than the historical events of the time.