Relatively recently, I have read a book about the Bicester Military Railway which was published in 1992. It was published by the Oxford Publishing Company and is widely available to buy second-hand. It is worth a read. ...
http://rogerfarnworth.com/2019/10/12/bicester-military-railway-book-reviewThe Bicester Military Railway. ...
This book, written by E.R. Lawton and Major M.W. Sackett in 1992, gives a comprehensive history of the Bicester site which extends from the original concept through to the date of publication of the book.
In the 21st century, large areas of the complex have been given over to civilian use.