The papers mainly consist of Kelly's recollections of his work for Churchill, in the form of memoirs and other papers, taped interviews, and in correspondence, particularly with Churchill's official biographer, Sir Martin Gilbert. There is also a small amount of correspondence dating back to Kelly's time as Churchill's literary assistant and two volumes of Winston Churchill's, "The Second World War" heavily annotated by Kelly, presumably for his own abridged version of these volumes.

Comprising Martin Gilbert's correspondence with Robert Hastings of Paul, Hastings, Janofsky and Walker (lawyers) and with Churchill College (including Churchill Archives Centre) staff.