This camp was discovered in 1945 and has been observed for a number of years but is still imperfectly known.
See: Air Reconnaissance of North Britain by J.K. St. Joseph in J.R.S. xli (1951) p.65; Air Reconnaissance in Britain, 1955-7 by J.K. St. Joseph in J.R.S. xlviii (1958) pp.92/3; Air Reconnaissance in Britain, 1961-64 by J.K. St. Joseph in J.R.S. lv (1965) p.83.