Thanks - here's another reference to them
http://www.hantsfieldclub.org.uk/publications/hampshirestudies/digital/1980s/vol39/Riall.pdf
and
http://www.farnhamweather.co.uk/about-farnham.htm
Quote: "Caesar's Camp"... is a very large earthwork on a high promontory, served by a spring which emerges from between two conglomerate boulders called the Jock and Jenny Stones.
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