I did some further research on the above subject and so here is a link to the site of a blogger who has made a thorough investigation of the Great Stones of Landywood. I don't want to spoil anyone's enjoyment so I post the link so that anyone interested can follow the trail post by post as I did!
http://joharrington.blogspot.co.uk/2011/10/hunt-for-landywood-great-stones-part.html
Something is not right. This message is just to keep things from messing up down the road