more information from Maeve Kennedy in the Guardian...

http://www.guardian.co.uk/culture/2012/oct/09/stonehenge-digital-laser-3d-survey

and some info to the previously asked question Roy...

"Writing about the project in the new issue of British Archaeology, Marcus Abbott, head of geomatics and visualisation for ArcHeritage, and Hugo Anderson-Whymark, an Oxford based expert on ancient worked stone, note that the 850 gigabytes of data covering hundreds of faces of the stones were equivalent to 750m pages of printed text or 200,000 music files.

"Over the months we have recorded and scrutinised every square centimetre of Stonehenge in unparalleled detail, revealing over 700 areas of stoneworking, rock art, graffiti, damage and restoration."