On the subject of giveaways...
I picked up a great book in a little 'green' shop in Chew Magna at the weekend. It is called 'Mendip from the Air' and is by Hannah Firth. 75 pages of aerial photos (nearly all in colour) of the landscape and man's effect on it. Great shots of Priddy henges and the nearby barrows amongst others
It states on the back "This book is free and must not be sold"
It was produced by Somerset Heritage Service in 2007 so there may be some more copies still availiable. The shop in Chew Magna still had a few more copies I think.
On the subject of aerial photography I was sent recently a piece out of 'Granta' about the life and times of OGS Crawford who was responsible for adding all the ancient sites to the early OS maps and 'discovering' things like woodhenge. I am not sure when it was published as I only got the relevant pages, not the whole magazine.
Mr H