In the ROC journal dated January 1988 and August 1986 Knockholt post was featured as the cover image, from what I can imagine it was likely Knockholt was the 'show post' for kent group, so all visiting government officials and high ranking ROC officials would be shown this post, it would also have been used on ROC open days for recruitment etc.
Today the post is meant to be restored and occasionally open to some selected groups as subbrit details...
The post from subbrit's visit.
The ROC journal picture from January 1988.
Again from subbrit, very nice restored post this....
And the internal picture from the August 1986 edition.
So there you have it some ROC history right there, original pictures from the ROC journal
ROC investigator away