The original Ministry of Works guidebook for Audley End in Essex was by Bryan H. St John O’Neil (1950). A third edition appeared in 1958, and this formed the basis of the (anonymous) Ministry of Public Buildings and Works Official Guidebook.
English Heritage replaced this guide with a new one by P.J. Drury and I.R. Gow (1984; 2nd ed. 1991). This had the standard ‘white’ cover with red title.
This was replaced in 1997 by a large format colour guide. The present English Heritage ‘red’ guide is by Paul Drury (2010).