Thanks, I'll check the Rev Skinners drawings out.
My father in law left a huge amount of antiquarian material in storage when he died. (He was a Doctor but his father was another Rev)
The battleAxe keeps promising to let me have access to it one day.
Apparently there is a huge rolled up drawing of a plan of Callanish amongst the papers and boxes of black & white photos of sites he took himself.
Here's a photo I took of the Fox Covert area last December.
It would have been a good site for a henge but I can't see any sign of it.
http://peteglastonbury.ic24.net/FoxC.jpg
PeteG