Both instructions were transcribed from The National Archives (TNA) WO 293/11 War Office: Army Council: Instructions (1920)
A.C.I. 145 of 1920 makes it clear for the first time that records from returning or returned units are to be sent to the Percy House Schools, Isleworth. R. (Records) had by 1921 emerged from the Disposal of Records Section.
A.C.I, 773 of 1920 further sets out the procedure for sending records to Isleworth, as well as service related records to the relevant Army Record Office and privately held material (other than the War Diaries which they were sent) of interest to the Historical Section (Military Branch) Committee of Imperial Defence at Cavendish Square.