Hi Steve:
Welcome to the forum.
What you seek is out there in the 2012, 214-page soft cover book Top Secret Boeing by Bob Shaw, put out by National Trust Croome in partnership with the Defford Airfield Heritage Group. Includes interior shots of the installed equipment and numerous references to documents held by the TNA at Kew.
ISBN 978-0-9547045-1-3.
One of those fascinating, less-well-documented topics.
Robert
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