Hi Elderford,
Sounds like you're doing sterling work down south.
:-)#
If you can get a grid reference for your mystery circle then the (ever so groovy) CARN database will do the rest for you...
http://www.rcahmw.org.uk/data/
It's a wonder living in Wales!
Kammer x
PS. If you go there, please email the webmaster ([email protected]) and complain about the stupid pop-up box thingy! It's driving me mad.