PERSONNEL OF SPECIAL COMMUNICATIONS UNIT NO. 1 AT "WINDY RIDGE", THE SPECIAL OPERATIONS GROUP WIRELESS STATION, WHADDON,
A friend sent a link to this on the IWM website.
https://www.iwm.org.uk/collections/item/object/205124675
Must check to see if anything else of interest there.
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I tried a search on that DVD title but too many DVDs and books with similar titles to be sure that found it.