Note:
Thank you to Graham Carter for the historical information in the comment box. I knew some of the gravestones date back to the 1600s but didn't realise the little church was quite that old. Linking this with the sarsen stone item, I wonder whether the Lawns is an ancient 'sacred site'. Going back a few hundred years, I understand that there was a water mill on the slope leading down to the lakes - there is definitely a spring (now underground) that feeds the lakes. I have a very interesting little booklet by T. Elwyn Jones called the Celtic Triangle where he says that Swyn means 'enchanted, holy, charm, magic or blessed' - Swyndon could therefore mean Enchanted Hill. Wandering around there in the February sunshine with the profusion of snow-drops it would be easy to think so.
English Heritage has scheduled this site as an Ancient Monument.